HomeMy WebLinkAboutTIC 2018-09-10 Item 2H - Discussion - Traffic Calming / Residential Safety Improvements Prioritiesity of Tu wila
Public Works Department - Henry Hash, Director
INFORMATIONAL MEMORANDUM
TO: Transportation and Infrastructure Committee
FROM: Henry Hash, Public Works Director / Jt
BY: Cyndy Knighton, Senior Program Manager
CC: Mayor Ekberg
DATE: September 7, 2018
SUBJECT: Traffic CalminglResidential Safety Improvements Priorities
Allan Ekberg, Mayor
ISSUE
Update the Committee on current requests for traffic calming treatments and other safety improvement projects.
BACKGROUND
Safety of both residential and commercial roadways is a priority for the City, residents, and businesses. The City monitors accident occurrences,
typically occurring with some frequency on higher volume commercial streets. Engineering solutions or police enforcement is applied to address
the identified needs. If a capital project is warranted to correct a deficiency, engineering analysis and design is completed, and a project is built.
If the cause of the safety concern is related to low compliance with existing laws, enforcement and education can be applied to improve safety
and increase compliance. The Public Works department and the Police department work closely together to address issues. Generally, however,
engineering, enforcement, and education are all required to improve safety and improve or maintain compliance.
When it comes to perceived safety issues on smaller, low -volume, and residential streets, the concerns are more typically raised by concerned
residents. To help prioritize and address safety concerns on residential streets, staff developed a Neighborhood Traffic Calming Program (NTCP)
in 2005, but no funding or staffing was made available. A pilot project on S 130th St was studied, resulting in the conversion of 35th Ave S
between Tukwila International Blvd and S 130th St into a one-way northbound street. In 2017, a second pilot project on S 160th St installed speed
cushions. The Transportation and Infrastructure Committee discussed the NTCP in October 2017 and again in June 2018.
DISCUSSION
During the most recent discussion at the Transportation and Infrastructure Committee, staff was directed to compile a list of all current requests
for traffic calming treatments, along with any data collection that had been completed. Additionally, staff was asked to list commercial locations
that are also identified for safety improvements. Seven specific locations and one citywide program for commercial streets were identified.
Thirteen specific locations, with more being added on a regular basis, have had traffic calming or other safety -related requests made by
residents. Most of the residential streets have data for volume, speed, and accident history but only on Southcenter Boulevard has speed data
been collected on the commercial streets. The primary purpose for collecting such data to determine if a safety issue exists and if it does, to aid
the City in prioritizing locations for any improvements.
When speeding is a primary factor in determining safety of a road section, engineers look to the 85th percentile speed and across the country,
those speeds typically range from 5-7 mph over the posted speed limit. In Tukwila's case, all the speed data available today shows the 85th
percentile speed in all locations counted to date is no more than 5 mph over the posted speed limit. This does not imply that there aren't violators
travelling at higher speeds, but rather they are the exception to the vast majority of drivers using the roadway.
FISCAL IMPACT
Public Works realized the importance of this issue. As a result, a new CIP project has been proposed for 2019, Traffic Calming/Residential
Safety Improvements, with $400,000 budgeted each year. This replaces the previously budgeted $750k for residential streets. Additional funding
is needed to complete identified improvements on commercial streets and any other improvements would need to identify a budget and
appropriate solution.
RECOMMENDATION
Information Only. After ranking priority list and rough cost estimates, staff will return to Committee and C.O.W.
Attachments: Priority List
page 8, Proposed 2019-2024 CIP
W:IPW EngIPROJECTSIA- RW & RS Projects\Traffic CalminglINFO MEMO Traffic Calming Priorities 090718gI.docx
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Priority List for Traffic Safety Improvements
Commerical Locations
Safety issue(s)
Average
Volume
Average
Speed
85th %ile
Speed
2013-2017 Accidents
Comments
PDO
Peda-cyclist
Injury
Fatality
Southcenter Blvd at 65th
Speeding, left turn delays, high
ped crossings
9,300
35
40
10
2
1
0
Signal warranted, radar sign and RRFB as interim
Southcenter Blvd at 62nd
Speeding, left turn delays, high
ped crossings
9,300
35
40
10
4
4
0
Existing RRFB
TIB at S.140th st
Pedestrian safety and left turn
delays
16,000
19
1
10
0
High pedestrian traffic area
Andover Park East at Minkler
Left turn delays
12,000
1
0
3
0
60% design completed
Andover Park East at Industry dr
Pedestrian safety and left turn
delays
12,000
1
1
2
0
60% design completed
S.133rd at 599 on/off ramp
Left turn delays
10,000
7
0
2
0
Feasiblity report but no design
West Valley Hwy at Ped bridge
pedestrian access/safety
28,800
2
25
0
3
16
0
Currently under design for West Valley improvements
Flashing Yellow arrow revisions to
signalized left turns throughout the City
Pedestrian safety and left turn
delays
Varies
FYA operation is safer for pedestrains and increases intersection
capacity when used in lieu of protect only phasing.
Residential Locations
S.144th at 46th Ave S
School Crossing safety
7,400 (13
hrs)
23
28
2
0
0
0
RRFB is ordered, to be install before school year.
Safe Routes to School Grant
S.164th at 4700 blk
Speeding
1,800
25
30
0
0
0
0
Macadam rd s at 13700 blk
Speeding/school bus stop safety
2,500
26
29
0
0
0
0
42nd Ave S at 11900 blk
Speeding
3,800
23
29
1
2
0
0
42nd Ave S at 13700 blk
Speeding/curve safety
4
1
3
0
Homeowner association claims 3 road departures in past year
62nd at 149th
School Crossing safety/speeding
1,600
1
1
0
0
Design work complete for ADA improvements.
44th Ave S at 11800 blk
Speeding
700
17
21
1
0
0
0
S.140th at 3500 blk
Speeding
3,700
20
25
0
0
0
0
51st Ave S 16200 Block
Speeding
3,300
25
30
3
0
0
0
S.148th at 4400 blk
Speeding
1,300
21
26
1
0
0
0
53rd Ave S at S.140th
Speeding
3,000
23
28
0
0
0
0
S.130th at 37th Ave S
n
Speeding
0
0
0
0
No current traffic data, on schedule soon
0
S.150th at Thorndyke Elementary
School Crossing safety/marked
xing
1
0
0
0
This was to be addressed with School remodeling
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 Through Estimated
2019
2020
2021
2022
2023
2024
BEYOND TOTAL
EXPENSES
Design
9
80
80
80
80
80
80
80
569
Land (RAN)
0
Const. Mgmt.
0
Construction
38
320
320
320
320
320
320
320
2,278
TOTAL EXPENSES
47
0
400
400
400
400
400
400
400
2,847
FUND SOURCES
Awarded Grant
0
Proposed Grant
0
Mitigation Actual
0
Mitigation Expected
0
City Oper. Revenue
47
0
400
400
400
400
400
400
400
2,847
TOTAL SOURCES
47
0
400
400
400
400
400
400
400
2,847
irF' Project Location
2019 - 2024 Capital Improvement Program
8
59