HomeMy WebLinkAboutCOW 2019-08-26 Item 3A - Update - 2019 Neighborhood Traffic Calming Program ProgressCOUNCIL AGENDA SYNOPSIS
Initials
Meeting Date
08/26/19
Prepared by Mayor's review I Council review
SB
ITEM INFORMATION
ITEM No.
3.A.
STAFF SPONSOR: HENRY HASH
ORIGINAL AGENDA DATE: 08/26/19
AGENDA ITEM TITLE Neighborhood Traffic Calming Program 2019 Update
CATEGORY N Discussion
Mtg Date 08/26/19
Motion
Mtg Date
Resolution
Mtg Date
Ordinance
Mtg Date
L f Bid Award
Mtg Date
U Public Hearing
Meg Date
❑ Other
Mtg Date
SPONSOR ❑Council ❑Mayor ❑HR OD CD Finance ❑Fire ❑TS ❑P&R ❑Police ®PW ❑Court
SPONSOR'S
SUMMARY
REVIEWED BY
Staff will update Council on the progress of the Neighborhood Traffic Calming Program
(NTCP). Currently $400,000 is budgeted in the 2019 - 2024 Capital Improvement Program
for Traffic Calming/Residential Safety.
❑ C.O.W. Mtg. ❑ CDN Comm
® Trans &Infrastructure ❑ Arts Comm.
DATE: 08/20/19
❑ Finance Comm. ❑ Public Safety Comm.
❑ Parks Comm. ❑ Planning Comm.
COMMI1'1 EE CHAIR: ZAK IDAN
RECOMMENDATIONS:
SPONSOR/ADMIN. Public Works Department
COMMII'IEE Unanimous Approval; Forward to Committee of the Whole
EXPENDITURE REQUIRED
$0.00
COST IMPACT / FUND SOURCE
AMOUNT BUDGETED
$400,000.00
APPROPRIATION REQUIRED
$
Fund Source: 103 RESIDENTIAL STREETS
Comments: (page 8, 2019 CIP)
MTG. DATE
RECORD OF COUNCIL ACTION
08/26/19
MTG. DATE
ATTACHMENTS
08/26/19
Informational Memorandum dated 08/16/19
Page 8, 2019 CIP
Resolution No. 1955 Neighborhood Traffic Calming Program
Map of 2019 NTCP Improvements (Revised after 08/20/19)
Matrix of Description of Traffic Calming Methods
Matrix of Traffic Calming Methods - General Overview
Minutes from the Transportation and Infrastructure Committee 08/20/19
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City of Tukwila
Public Works Department - Henry Hash, Director
INFORMATIONAL MEMORANDUM
TO: Transportation and Infrastructure Committee
FROM: Henry Hash, Public Works Director
BY: Cyndy Knighton, Senior Program Manager
Scott Bates, Traffic Engineering Project Manager
CC: Mayor Ekberg
DATE: August 16, 2019
SUBJECT: Neighborhood Traffic Calming Program
Project No. 80910301
2019 Progress Report
Allan Ekberg, Mayor
ISSUE
Provide a summary of progress to date for the Neighborhood Traffic Calming Program (NTCP).
BACKGROUND
The NTCP was adopted by Council Resolution (No.1955) at the end of 2018 to address neighborhood
concerns with traffic safety. The Council also wanted to ensure that traffic calming safety decisions are
based on technical engineering and applied in a uniform and consistent manner. The 2019-2020 budget
provides annual funding to implement traffic calming strategies on residential streets and other safety
improvements throughout Tukwila. Although some work was accomplished in 2018, this program is taking
off and much more has been accomplished in 2019.
DISCUSSION
Staff has collected requests for traffic calming treatments and other improvements in residential areas
for many years. Requests for calming treatments and other safety improvements come into staff via a
variety of ways:
• Enrollment requests from the City's website • Face-to-face conversations
• See-Click-Fix/Tukwila Works • Other Departments, especially Police
• Email inquiries • Historical knowledge
• Phone calls • Elected officials
The NTCP is a welcoming program for our community and has already produced positive results to
improve safety. When the Council adopted the NTCP, staff had a list of approximately 22 requests.
Currently, there are more than 40 individual requests for improvements, and it is not uncommon for new
requests to come in weekly.
The NTCP has two levels of calming treatment types to use. Level I treatments are considered passive
traffic control and are generally less restrictive than Level II treatments. Level II treatments focus on
physical devices which are more costly and restrictive. Due to an increased number of requests today,
staff is not strictly following the steps of the NTCP.
In order to begin addressing requests quickly, staff has been installing new permanent speed feedback
signs and LED enhanced signs which fall under the Level 1 category of improvements in the NTCP.
Additionally, staff has installed many new parking restriction signs at the request of both residents and
the Police Department to aid in enforcing parking violators and improve safety. These also fall under the
Level 1 category.
WAPW Eng I PROJECTSIA- RW & RS Projectsgraffic Calming1Tukwila Traffic Calming Program\NTCP 2019 Progress report.docx
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Traffic Calming Info Memo
Page 2
The attached map shows the locations where traffic calming treatments have been implemented bodate.
Requests have come in for new crosswalks in the vicinity of schools, parks and other high pedestrian
generation areas. Crosswalks require engineering study bJensure that they are safely sited, and the City
is legally protected. For example, one location, 8 144m Street at 37 m Avenue G. staff is recommending
installation of a Rectangular Rapid Flashing Beacon (RRFB) on the west leg of the intersection's existing
crosswalk because of the close proximity to high density residential and the Cascade View Park. Anew
marked crooavvo|k is considered a Level 1 tnaatmnent, but the F{FlFB is a Level 2.
KPG has recently been contracted to assist staff with the engineering for oroaevva|k siting studkeG,
development of general RFlFB p|one' and other needs that may come up on an on -call basis. It is likely
that additional consultants would also be retained for on -call engineering services to support the NTCP
The NTCPis agreat program that brings staff closer b»the community which helps staff understand their
needs and issues. In order to keep up with the requests in a tirne|y, professional and safe rnanner, o
more orgmnized, programmatic traffic calming program is needed. To reach this point' dedicated staff are
required to provide accurate ranking and studies as well as to install and maintain the additional
infrastructure. Additional staffing will move this new program into one that complies fully with the adopted
NTCP.
RECOMMENDATION
� �
Information only. Committee is being asked to have the Neighborhood Traffic Calming Prwgnorn update
presented to full Council at the August 26, 2019 Committee of the Whole.
ATTACHMENTS
�
� Page O.2O19QP
° Resolution No. 1955—Neighborhood TraffioCo|nning Program
* Map of2U1SNTCPimprovements
* Matrix ofDescription ofTraffic Calming Methods
* Matrix ofTraffic Calming Methods — General Overview
CITY OF TUKWILA CAPITAL PROJECT SUMMARY
2019 to 2024
PROJECT: Traffic Calming/Residential Safety Improvements Project No. 90210301
Programmatic approach to addressing neighborhood traffic concerns through a variety of methods.
DESCRIPTION: Residential street improvements with sidewalks, safety improvements, and bike facilities.
JUSTIFICATION: Neighborhood revitalization by improving residential streets.
STATUS: Future candidates are listed in the citywide comprehensive update and safety -based prioritization of
residential street improvements, sidewalks, and bike lanes.
MAINT. IMPACT: Varies, depends on treatment(s) used.
COMMENT: Residential improvements have included 42nd Ave S, 53rd Ave S. Speed cushions installed at S 160th St.
FINANCIAL
(in $000's)
EXPENSES
Design
Land (RAN)
Const. Mgmt.
Construction
TOTAL EXPENSES
Through Estimated
2017 2018 2019 2020 2021 2022 2023 2024 BEYOND TOTAL
9
38
47
0
80
320
400
80
320
400
80
320
400
80
320
400
80
320
400
80
320
400
80
320
400
FUND SOURCES
Awarded Grant
Proposed Grant
Mitigation Actual
Mitigation Expected
City Oper. Revenue
TOTAL SOURCES
47
47
0
0
400
400
400
400
400
400
400
400
400
400
400
400
400
400
569
0
0
2,278
2,847
r--
0
0
0
0
2,847
2,847
Project Location
2019 - 2024 Capital Improvement Program
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6
Washin
Resolution No.
A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF
TUKWILA, WASHINGTON, ADOPTING THE "CITY OF TUKWILA
NEIGHBORHOOD TRAFFIC CALMING PROGRAM."
WHEREAS, one of the top concerns of Tukwila community members is speeding and other
dangers associated with motor vehicles; and
WHEREAS, the City of Tukwila desires to reduce the negative effects of motor vehicle use,
alter driver behavior, and improve conditions for non -motorized street users; and
WHEREAS, the adopted Tukwila Comprehensive Plan recommends implementation of a
neighborhood traffic calming program in both the Transportation Element and the Residential
Neighborhoods Element; and
WHEREAS, the City Council desires to document a transparent, predictable and equitable
process for implementing effective traffic calming measures in neighborhoods throughout the City;
NOW, THEREFORE, THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON,
HEREBY RESOLVES AS FOLLOWS:
The "City of Tukwila Neighborhood Traffic Calming Program," as evidenced in Exhibit A, is
adopted.
PASSED BY THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, at a
Special Meeting thereof this lez/TH day of e 0 hp , 2018.
AlI EST/AUTHENTICATED:
Christy 0'
APPROVED AS TO FORM BY:
Rachert. Turpin, City Attorney
Attachment: Exhibit A — City of Tukwila Neighborhood Traffic Calming Program
WAINord Processinglisleighborhood Traffic Calming Program 11-30-18
LH:*
Verna e Cou President
Filed with the City Clerk:
Passed by the City Counc
Resolution Number:
Page 1 of 1
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CITY OF TUKWILA
PU . LIC 0 KS DEPA ' T ENT
Adopted December 10, 2018
By Resolution No. 1955
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Table of Contents
OBJECTIVES 1
PROCESS STEPS 1
INITIATING A REQUEST 1
PRELIMINARY EVALUATION 2
SOLUTION ALTERNATIVES 2
No Action 3
Level I 3
Level II 3
PROCESS FOR QUALIFYING FOR LEVEL II TREATMENTS 3
PLAN DEVELOPMENT 4
PROJECT FUNDING 4
PROJECT DESIGN AND CONSTRUCTION 5
EVALUATION 5
RE -ENROLLMENT 5
APPENDICES
APPENDIX A: DEFINITIONS OF TYPES OF STREETS
APPENDIX B: PRIORITY RANKING WORKSHEET
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Introduction
Traffic conditions on residential streets greatly affect neighborhood livability. Speeding and
unnecessary through -traffic in neighborhoods create safety hazards on residential streets. The City
of Tukwila Public Works Department has developed a Neighborhood Traffic Calming Program
(NTCP) to guide City staff and inform residents about the procedures for implementing traffic
calming on residential streets and collector streets.
The NTCP is designed for local residential streets and collector arterials only. The NTCP does
not apply to local or arterial streets in commercial areas or to streets classified as principal or minor
arterials.
As defined by the Institute of Transportation Engineers (ITE), traffic calming is the application of
measures which can be taken which reduces the negative effects of motor vehicle use, alters driver
behavior and improves conditions for non -motorized street users. The City's NTCP outlines a
process for staff and residents to carry out a traffic calming program. It provides a way to
objectively prioritize traffic calming requests. These procedures incorporate prioritization,
planning, evaluation, implementation, and maintenance of the traffic -calming devices in
residential areas. It also combines the four E's — Education, Engineering, Enforcement and
Emergency Services.
Objectives
The primary goal of the City's NTCP is to improve the livability of the local streets and residential
collectors. The City has identified the following objectives:
• Provide alternative solutions to reduce vehicular speeds and accidents on residential streets.
• Endorse safe and pleasant conditions for motorists, bicyclists, pedestrians, and residents of
neighborhood streets.
• Provide a means for a collaborative working relationship between City staff and
neighborhood residents in development of traffic calming measures.
• Discourage use of residential streets for cut -through vehicular traffic.
Process Steps
Initiating a Request
Request for traffic calming assistance can come from a resident's association or from concerned
individuals. Requests can be made in writing by clearly stating the problem and location,
accompanied with completed application which is provided by the City. The request can be made
by either mailing or emailing the request to the Public Works Department. The request must
include a contact name, address, phone number and email.
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Staff will then acknowledge the completed application in writing to the resident's association or
to the contact person listed in the application. An application fee could be implemented in the
future to offset some of the costs involved.
Preliminary Evaluation
Each street in the community is a part of the larger roadway network that connects residents to
each other, work, schools, goods, services and the countless destinations to which drivers and
pedestrians travel daily. Common issues within neighborhoods include speeding, traffic volumes,
and the utilization of neighborhood streets as a cut -through route, among others. In order to ensure
that traffic calming concerns are addressed in an equitable manner, staff must assess the situation
by reviewing the request and determining if the area qualifies for treatment using set criteria. The
primary purpose of a preliminary evaluation is to determine whether the speeding or accident
situation is significant enough to warrant further study. At this stage, staff collects data to analyze
it to determine whether:
• The roadway is eligible for traffic calming treatment.
o Only residential streets classified as collector arterial or local access are eligible.
• City recorded data supports the problem identified in the application.
o Speeding: Traffic counts are taken to determine if 15% of the motorists travel at 5
mph or more above the posted speed limit. This is also referred to as the 85`11
percentile speed being at or above 5 mph over the speed limit.
o Volume: Traffic counts also collect the number of daily vehicles on a street. This
information is used to determine the best type of solution and is used to rank project
priorities.
o Traffic Accidents: The number of accidents for over a three-year period is collected
and studied.
The Public Works Director has the discretion to move an application forward or to address any
safety issues discovered outside of the NTCP process.
If the analysis confirms that a traffic problem exists based upon the above criteria, the Public
Works Department will conduct a traffic calming study as explained in the following sections and
staff calculates the priority score for the street segment using the Priority Worksheet in Appendix
C.
A written response back to the contact person with the findings of the preliminary evaluation is
generally provided within 60 calendar days of the request.
Solution Alternatives
The solution alternatives are defined into three levels.
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No Action
After data collection and analysis is complete, any location not meeting the above criteria will be
determined to not be eligible for any NTCP assistance. Staff will inform the applicant in writing
that their request does not meet the City criteria for action and the request will be closed.
Level I
The first level improvement for traffic calming that should be considered are passive traffic control
treatments, known as Level I. Level I improvements are less restrictive measures, and do not
require a vote of the affected residents. The improvements used in Level I include: trimming
bushes to allow better sight distance; pavement markings and striping; increased police
enforcement; traffic speed display signs; neighborhood awareness campaigns; and education. This
reduces the need for installing physical devices on every local street.
If a marked crosswalk is recommended for installation where ADA-compliant ramps do not
currently exist, the improvement will be automatically treated as a Level II solution.
Level H
Level II improvements should be considered only after Level I treatments have been in place for
a minimum of 6 months and data collection and analysis indicate the problem(s) has not been
resolved, or as determined by the Public Works Director. Level II improvements focus on physical
devices such as speed cushions, traffic circles, and chicanes to calm traffic. These solution
alternatives are much costlier than Level I and are generally permanent. Therefore, a more detailed
evaluation is required and approval by key departments and impacted area residents is required
before the implementation. The detailed evaluation includes as follows:
• The speed, volume and accident history collected during the preliminary evaluation.
• Collect new traffic speed and volume data and accident history for the past three
consecutive years.
• Other factors such as proximity to schools, parks and other pedestrian generators, lack of
sidewalks, accessibility, presence of bicycle facilities, and other roadway characteristics.
• Identify users of the affected streets.
• Identify traffic and major pedestrian generators, such as schools, parks and shopping
centers.
• Analyze street use with respect to street classification.
• Document any other relative factors.
Process for Qualifying for Level II Treatments
If the traffic problem(s) has not resolved with Level I treatments, an impact area is established by
staff after identifying users of the affected street(s), identifying major traffic generators such as
schools and parks, analyzing the actual street use with respect to roadway classification, and any
other relative factors. The impact area includes the location requesting treatment as well as other
streets in the immediate area that could be impacted by Level II treatment installation.
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Plan Development
Once an area has been selected for a traffic -calming project, steps need to be taken to determine
solutions. The applications are prioritized based on the scores. The highest-ranking applications
will be given priority in moving forward into Plan Development, as funding allows.
Since Level I solutions are simpler in scope, the solution formulation process can usually be
handled by staff. Public meetings are not usually required, although some type of public
communication is beneficial and recommended.
Level II improvements require a more comprehensive plan development due to the higher cost and
impact of the actions taken. A public meeting with all affected residents may be held, as
determined by the Public Works Director. The initial public meeting will:
• Discuss the steps to develop a traffic -calming plan.
• Gather additional information regarding traffic problems and related neighborhood needs.
A ballot may be provided to each resident, either in person or via the postal service, to vote to
indicate support of the NTCP plan. The implementation plan must receive at least 2/3 approval of
all residents on the impacted street in order to proceed. In addition to the community support, the
approval of the following public officials is required:
• City Police and Fire Departments
• City Council
Once the necessary level of support is documented, projects may be funded and constructed
according to their prioritization and as available staffing and budget permits.
In cases where a Level II request does not receive sufficient support, the project is dropped from
the list and the next highest ranked project can go through the same process. Residents in an area
where a project has been dropped are able to resubmit their request for the following program year.
Project Funding
The number of traffic -calming projects undertaken each year depends on the City's budget and
staffing availability. The City Council's Transportation & Infrastructure (or successor) Committee
will be kept apprised on projects both proposed and selected on a regular basis, and the City
Council will be notified of the NTCP's progress and expenditures at least every six months.
In some cases, landscaping, maintenance and necessary easement dedication may be the
responsibility of the residents or the homeowner's association. If this is the case, an agreement
must be signed between the City and residents before the project is implemented.
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Project Design and Construction
Once traffic -calming treatments have been determined, the City's staff or a consultant develops
the detailed plan, based on the study and the residents' input. The traffic calming device will be
installed.
In some situations, a test installation may be warranted to assure that the device is both effective
and truly desired by the community. In this case, within three to twelve months after installation,
staff evaluates how well the test installation perfoimed in teims of the defined problems.
Evaluation
An evaluation shall be conducted between six months to one year after the implementation of any
permanent traffic calming devices. Speed, volume and collision data is collected and compared
with the data collected before the installation of the traffic -calming device. The data collection
should be done at approximately the same time of year as the original data collection.
Re -enrollment
If additional traffic calming treatments become necessary in the future due to changes in traffic
patterns unrelated to the NTCP treatments, requests can be made for a new enrollment 12 months
or more after the last evaluation period has been completed. The submission will be treated as a
new request beginning with preliminary evaluation and will follow the NTCP process. Any future
traffic calming treatments will be scored and ranked along with all other active requests and are
subject to funding and staffing availability.
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Appendices
16
Appendix A: Definitions of types of streets
The City's Transportation Element of the Comprehensive Plan defines the street functional
classifications. For the sake of this program, only residential local streets and collector arterials
are eligible for NTCP treatments. Streets in commercial areas or which are classified as principal
or minor arterials are not eligible for treatments under this program. Traffic calming on principal
and minor arterials is very different than on residential streets, requiring substantial design,
permitting, environmental approval, and budget in order to construct. These calming projects are
developed into standalone capital improvement projects.
Local streets (typical speed limit 25 mph) serve local circulation needs for motor vehicles,
bicycles, and pedestrian traffic and provide access to residences and some businesses. Local
streets are not intended to carry significant volumes of through traffic. Sixty to 80 percent of
the roadway network is considered local streets.
Collector arterials (typical speed limit 30-35 mph) are typically streets that provide access
between local service streets or from local streets to thorough -fares. Collectors often carry
some through traffic. Collectors in residential areas are eligible for NTCP treatments whereas
collectors in commercial areas are not. Five to 10 percent of the roadway network is classified
as collector arterials.
Minor arterials (typical speed limit 30-40 mph) are streets which are typically wider and
may have more lanes than collectors which connect the smaller arterial streets to destinations
or to the regional roadway network. Minor arterials carry a large percentage of through traffic
as well as traffic from the local area. Ten to 20 percent of the streets in network are minor
arterials.
Principal arterials (typical speed limit 35-50 mph) are major streets and highways that
provide regional connections between major destinations. Speeds are higher, access and
traffic control favors providing fast and smooth movement on the arterial over the lower
classified streets. Five to 10 percent of a roadway network is classified as principal arterials.
17
El
LE.OFNItl
Roadway Classification
—,-- Freeway
- Principal
— Minor
Collector
77; City of Tukwila
C.: Potential Annexation Area
N1OT TO SCALE
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ROADWAY CLASSIFICATION
Appendix B: Priority Ranking Worksheet
Location:
Date:
Staff Name:
Catelt)t.y
Accidents:
Five points for each recorded accident over the past three years. Three
additional points will be added for each accident with a recorded injury.
Volume:
Average weekday traffic volume divided by 100, rounded up to the
nearest whole number. Maximum of 7 points possible.
Speed:
Five points for every mph greater than 5mph above the posted speed or
(85th percentile speed - posted speed limit - 5) x 5 points.
Sidewalks:
Five points if there is not a continuous sidewalk on one side of
residential streets or both sides of collectors.
Pedestrian Generators:
Five points for every K-12 school on and 2 points for school property
within 500 ft of the subject street. Three points for other major
pedestrian generator on the subject street. Major pedestrian generators
may include parks, community centers, senior housing, or other uses
with sinificant sedestrian traffic.
Data
Total Points:
Score
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City of Tukwila
NTCP 2019 Installations
NOT TO SCALE
Pending
LED Curve Signs
IPA Speed Cushion
Radar feedback
tD LED Stop Sign
RRFB Crossing
School Zone Flasher
Map Legend
• City Facility
City Bathroom
• Fire Station
Police Facility
School
Trail
Street
Tukwila Park
Waterbody
City Limits
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Descriptions of Traffic Calming Methods
Method
Description
Speed Watch
Program
Radar Speed
Signs
, Residents check out radar gun and gather speed data inspot locations
^ Data gathered isused k)validate other speed data
• Residents learn what certain speeds "feel like" when standing on or near the roadway
, Solar powered signs can be installed permanently or rotated
^ Can bHused inconjunction withVtamo enforcement emphasis -- traffic officers can be found further down the road to provide
police back up of the legal speed limit
Targeted
Enforcement
, A progressively stricter enforcement schedule with low thresholds for citations
• Traffic officers work a select location over a period of time, graduating from marked police cars to ultimately unmarked cars
Striping
Vegetation
Trimming
- Installing center, walkway, and edge line markings to narrow or modify the travel lanes
, Unique striping in individual cases can be used successfully
, Striping can include
yellow center skip strip
white edge lines
wording onpavement
oodwalkways and bike lanes
marked crosswalks
, Applications are determined iOeach instance and can bemodified tofit
individual needs
, Paint cannot boapplied year round — weather dependent installation
, Striping anunntripodroadway gives the appearance Vf8narrowed road
and assigns where vehicle and pedestrian areas are located
P.1 1mt e ("I
ON Poxnre�
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!,
City crews will trim vegetation in public i h)improve sight distance c8intersections, sign visibility, orgeneral safety
Vegetation that is in private property can only betrimmed bvcity crews ifimpeding sight distance orcreating osafety hazard
Property owners are always first encouraged to trim their private plantings
Improved Signage
Signs already inplace may bo improved by installing lamer signs,orLEDenhanCodsigns
New signs may beinstalled oowarranted
Existing signs may be relocated to provide maximum impact
Traffic Safety
Campaign
^ This effort not currently defined bvTukwila
, Could include development oftraffic safety brochures orflyers
, Could bedeveloped Vnincorporate local high school education
, Could be jointly implemented using the PDSprint program and targeted enforcement
Multi -way Stop
,All-wayormulti-way stops are installed at intersections where traffic flows are generally fairly equal Onall legs
, Engineering warrants must bemet before installation can occur
Pedestrian Safety
Measures
, Improvements can include:
Sidewalk orwalkway installation
Crosswalk installation
paint
textured pavement treatment
Pedestrian signals (RRFB'HAYVK)
Pedestrian scale lighting improvements
Pathways
Raised crosswalks
Mid -block crossings
with orwithout
refuge area
, Sometimes called planter islands, these are typically long and narrow islands placed inthe middle ofroads etintersections
^ 0nwide streets, curb
extensions may beused on
both sides (fthe roadway
while still maintaining 2
lanes of roadway width
~ In some cases, pedestrian
amenities such aoraised
crosswalks, decorative
pavement, orsimple
painted crosswalks are also
included eapart ofthe
treatment
^ May also include additional
street lighting for the
intersection and decorative entrance signs
23
'
Traffic Circle
'SoeadCunh�O
�
Turn Prohibitor:
Signing
restrictions
Turn Prohibitor:
|Physical deterrent
�
Diagonal Road
Closure
Street Closure
Descriptions of Traffic Calming Methods
Description
, Round islands installed atintersections tUforce traffic tOcircle around the
island, thus disrupting the flow of traffic
~ Less expensive traffic circles can be painted0Othe asphalt, marked with
� raised pavement markers
, More costly traffic circles are made with curbing and back filled with asphalt
, The most expensive traffic circle toconstruct include curbing and removal of
existing asphalt from the center. Soil and approved landscaping are installed
wru
,Aseries of tight turns inastraight section of road that restricts traffic speeds
, Fire Code may limit chicanes orany other treatment from narrowing the road
� toless than 2Ofeet
^ Chicanes can bemade of wooden traffic barricades, curbing with fencing,
curbing with asphalt back fill, urcurbing with landscaping
• Can be combined with on -street parking
,Araised mound across the roadway that reduces speeds 3Svehicles
travel over them
^ TUbaeffective, should boplaced 3OO500feet apart and installed in8
series oftypically etleast 2cushions
, Not recommended onprimary emergency response routes OrVnmajor
transit routes
~ Signs are placed atintersection to restrict certain turning movements ortoonly allow acertain movement
~ Restrictions can beall the time orcan boduring certain times ofday only
, Also known aahalf orpartial closures Urdkmrtnm
, Physically directs traffic flow atintersections, prohibiting specific movements
, Many variations can beimplemented, depending onthe need of the particular street
, Can becombined with pedestrian amenities such as textured pavement orraised crosswalks
.
,Diagonal road closure completely closes 8road to through traffic without
completely closing aroad
^ Diagonal divoderocan beused k>fully orpartially divert traffic
, Implementation can bedone hvusing wooden barricades, concrete
barricades, curbing, and landscaping
^ Diagonal divartensare not applicable inmost places eominimum travel lane
widths 0f2Ofeet must still bemaintained
, Streets are closed to through traffic bvforming aoul-de-sam
hammerhead
, Additional hght-of-wavmay bonecessary 10construct the ou|'d8-oauor
hammerhead
^ Street closures are not applicable inmost locations
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Method
Potential
Degree of
Effectiveness
Advantages
Traffic Calming Methods - GENERAL OVERVIEW
Disadvantages Volume Speed Noise & Safety Access
Reduction Reduction Pollution Restrictions
Emergency
Vehicle
Access
Dependence
on Police
Enforcement
Operation Maintenance
and/or Cost/
Construction Problems
Cost
Speed
Watch
Program
Radar Speed
Trailer
Target
Enforcement
Striping
Vegetation
Trimming
Mild
d
Mild
Mild
Mild
•
Educates residents on what the
legal speed limit "feels" like from a
pedestrian stand point.
Educates motorists of their current,
actual speed of travel
Makes motorists aware of the
activeness of the community the are
driving through.
• Does not reduce speeds or volumes.
• Only changes behavior in motorists while in place.
• Some motorists use the reader board to "clock" how fast they
can go.
o Only when
Present
N/A
N/A
N/A N/A
N/A N/A
•
•
Reduces speeds and raises
awareness of drivers.
Does not require infrastructure
construction
Can promote slower traveling
vehicles
Best in correcting vehicles traveling
in middle of road
Can significantly reduce speeds of
users
Increases visibility.
• Effective only when program is ongoing
• Staffing needs vary based on area specific needs
• Not commonly used method of speed control
• Degree of effectiveness may vary substantially
Very Sligh
Yes
N/A
Possibly N/A
Improved
N/A N/A
N/A
N/A
N/A
None to High Low to
Can be used in Moderate
conjunction
with target
enforcement
High
N/A
N/A
Low
N/A
Unlikely Possible
N/A
Improved
Signage
Mild • Corrects sign deficiencies
• Develop motorist awareness of
regulations and restrictions
• Must be constantly maintained
• Must be constantly monitored
• Requires monitoring and planning to avoid visual clutter
• Probably not effective to habitual violator
No
0
Unlikely Unlikely
N/A
Increased
visual
pollution
Traffic
Safety
Campaign
Multi -way
Stop
Gateway/
Entrance
Treatment
Pedestrian
Safety
Measures
ild
Mild to
Moderate
• Raises awareness, cooperation, and
appreciation of general motoring
public.
• Creates more stopping points for
vehicles
• Addresses concerns at locations
with conflict potential
Moderate • Provides visual transition between
arterials and residential areas
• Can improve pedestrian crossing
safety on wider streets
Moderate
• Creates clearly defined areas for
pedestrians
• Provides safer areas for pedestrians
Traffic Circle Moderate
• Requires reduction in vehicle speed
without use of stop signs
• Removes conflict potential for many
types of accidents
• City does not currently have a program established
• Requires development of program and continuation of staffing
and program
• Impact may be reduced when "newness" of program is lost
Possible
N/A
Possibly None
Improved
Improved N/A
Possibly N/A
Improved
Slight N/A
Improve
ment
No Problem
N/A
N/A
N/A
N/A
N/A
0
oderate
Low to
Moderate
Moderate
Low to
Moderate
Low
N/A
Moderate
Low
Low
• Stop signs that are installed that don't meet engineering Slight
warrants are often not obeyed by motorists familiar with the
intersection(s)
• Can reduces pedestrian safety if not correctly installed
• Should not use Stop signs as speed control: stop signs should
be used to define right of way at intersections only
• Speed change could result in rear -end accidents
• May move traffic/problem to other roads
• Neglect of landscaping can become a sight distance problems
• Neglect of landscaping can become neighborhood "eyesores"
• Ongoing maintenance costs
• Definition of who is responsible for maintenance - possible
landscape maintenance agreements with residents
•
•
Sligh
Possible Slight
May be restrictive for larger vehicles or vehicles with trailers Possible
May move traffic/problem to other roads
May require additional lighting
May be confusing for left turns
May require additional Right-of-way
Requires consideration for aesthetics
Requires consideration for maintenance of landscaping, if
used
ikely
Increased Mixed
No
Change
None
Possibly None
Improved
Mixed None
No problem
No Problem
No Proble
Moderate to
High
N/A
N/A
Low
Low to
Moderate
Low
Low to
Moderate/
Possible
Vandalism
Moderate Moderate
Improved None
Some
Constraint
La
Moderate Moderate/
Possible
Vandalism
CJJ
Method
Potential
Degree of
Effectiveness
Advantages
Traffic Calming Methods - GENERAL OVERVIEW
Disadvantages
Chicane
Moderate • Effectively slows motorists traveling
I through and approaching the treated
section
• Can be designed to improve
pedestrian safety.
•
Moves traffic/problem to other roads
May be restrictive for larger vehicles or vehicles with trailers
May require additional lighting
Can create confrontations between opposing motorists
Fire codes requirement must be maintained
Requires consideration for aesthetics
Requires consideration for maintenance of landscaping, if
used
Volume
Reduction
Yes
Speed
Reduction
Yes
Noise & Safety
Pollution
Decrease
Access
Restrictions
ixed None
Speed Hump
Turn
Prohibitor:
Signing
restrictions
Turn
Prohibitor:
Physical
deterrent
Diagonal
Road
Closure
Street
Closure
Extreme
• Reduces speeds of vehicles at and
in the vicinity of the bump
• Can be designed for any speed
• Better if used in a series of 300 to
500 foot spacing.
Moderate • Can reduces through traffic.
Extreme • Reduces through traffic.
Extreme • Eliminates through traffic
• Provides for landscaping
• Reduces conflicts
• Increases pedestrian safety.
Extreme • Eliminates through traffic
• Can reduce speed of remaining
traffic
• Improves safety on the street closed
• Causes increased noise from braking and accelerating
vehicles, particularly if there are loose items in the vehicle
• May move traffic/problem to other roads
• Causes delays in emergency vehicle response time
• Not supported by Fire Department
• Can cause damage to fire trucks during emergency responses'.
• Moves traffic/problem to other roads
• Inconveniences local residents in gaining access to their
property
• Becomes an_ enforcement problem
• Moves traffic/problem to other roads
• Inconveniences local residents in gaining access to their
property
• Can affect emergency vehicle response time
• Becomes an enforcement problem
• Not viable in most locations
• Moves traffic/problem to other roads
• Inconveniences local residents in gaining access to their
property
• Not generally supported by Fire Department
• Affects emergency vehicle response time
• Reduces accessibility of emergency vehicles
• Forces the problems onto another street
• Reduces access to properties by residents
Possible
Yes
Yes
Yes
Yes
Yes
Possible
Likely
Likely
Yes
Increase
at humps
Improved
None
Emergency Dependence
Vehicle on Police
Access Enforcement
Minor
Constraint
Minor
constraint
N/A
Operation
and/or
Construction
Cost
Moderate to
High
Self Enforcing Moderate
Maintenance
Cost/
Problems
Moderate to
High/Possible
Vandalism
Moderate/
impacts street
sweeping,
snow removal
Decrease Mixed
Decrease Improved
Decrease Improved
Decrease Improved
Somewhat
Restricted
Restricted
Minor Moderate to - Low
Constraint High
Some
Constraint
Left or Right Some
turn only Constraint
Yes
Moderate/
Possible
Vandalism
Moderate to Moderate to Moderate/
High High Possible
Vandalism
Low to High, High
dependent on
features
Some Lo
Constraint
Moderate/
Possible
Vandalism
Moderate to Moderate to
High High/Possible
Vandalism
City of Tukwila
City Council Transportation & Infrastructure Committee
TRANSPORTATION & INFRASTRUCTURE COMMITTEE
Meeting Minutes
August 20, 2019 - 5:30 p.m. - Hazelnut Conference Room, City Hall
Councilmembers: Zak Idan, Chair; Thomas McLeod, Kathy Hougardy
Staff: David Cline, Scott Bates, Hari Ponnekanti, Han KirklanGail Labanara, Cyndy
Knighton, Laurel Humphrey
CALL TO ORDER: Committee Chair Idan called the meeting to order at 5:30 p.m.
I. BUSINESS AGENDA
A. Resolution: King County Comprehensive Solid Waste Management Plan
Staff is seeking Council approval of a resolution that would adopt King County's Comprehensive
Solid Waste Management Plan, which is pending approval of cities representing at least 75% of the
population during the 120-day approval period. The Plan outlines programs to prevent, recycle, and
dispose of waste, and includes six major planning elements: existing solid waste system, forecasting
& data, recycling, transfer & processing, disposal & landfill management, and finance. UNANIMOUS
APPROVAL. FORWARD TO SEPTEMBER 3, 01 REGULAR CONSENT AGENDA.
B. Interlocal Purchasing Agreement: Job Order Contracting
Staff is seeking Council approval of an Interlocal Joint Purchasing Agreement with the City of
Bellevue which would provide access to the use of their Job Order Contract (JOC) for a
maximum amount of $1,000,000. A JOC is a State -approved procurement method in which a
contractor agrees to provide an indefinite quantity delivery of negotiated and definitive work
orders from a pre -established catalog On contracts over a fixed period. The City of Bellevue's
JOC has a $4 million capacity per year over three years, and this Agreement would allow
Tukwila use up to $1, million of this capacity over the same period. The maximum dollar
amount for any one work order i$500,000. Committee members discussed the proposal and
requested that staff present this to the Committee of the Whole since it is a new method of
procurement for the City. UNANIMOUS APPROVAL. FORWARD TO SEPTEMBER 10, 2019
COMMITTEE OF THE WHOLE.
C. Neighborhood Traffic Calming Program
Staff provided a summary of progress and efforts to date for the Neighborhood Traffic Calming
Program, which was adopted in 2018 by Resolution 1955 to address resident concerns about
traffic safety. The program is taking off and staff has been installing new permanent speed
feedback signs, LED enhanced signs, and parking restriction signs. Requests for new crosswalks
have come in, but these require engineering study and are classified as a Level 2 treatment under
the Program. Staff has contracted KPG, Inc. for assistance with engineering and may require use
of other consultants in the future. Committee members and staff reviewed a matrix of requests
that indicates rank, location, assessment information, status and more. Councilmembers asked
clarifying questions. Chair Idan suggested adding requests and their status to the City's website.
FORWARD BRIEFING TO AUGUST 26, 2019 COMMITTEE OF THE WHOLE.
27