HomeMy WebLinkAboutPlanning 2013-05-23 Chapter 4 - 2030 Intersection Levels of ServiceCity of Tukwila: Background Report for the Transportation Element of the Comprehensive Plan Update
Transportation Analysis and 2030 Improvement Recommendations
May 2012
CHAPTER 4. 2030 INTERSECTION LEVELS OF SERVICE
The intersection levels of service (LOS) for 2030 were calculated with the same method used to obtain
existing LOS using Synchro and SimTraffic. Volumes were generated by the 2030 Tukwila travel demand
model. To reduce model error, a technique known as the "difference method" was used to develop the
2030 traffic forecasts. The difference method adds the travel model's estimated growth in traffic between
2010 and 2030 conditions to the 2010 traffic counts taken at each location. This technique eliminates
much of the model error by using existing traffic counts as the basis of the forecast rather than direct
model output.
The analysis assumed that all signal timings for intersections in Tukwila would be optimized during the
next 20 years; however, cycle lengths were not adjusted. Synchro was used to optimize the signal
timings.
The 2030 intersection LOS was computed for AM and PM peak hour conditions across the entire City.
Midday and Saturday peak periods were analyzed only for signalized intersections in the Southcenter
area. LOS results are shown in Figures 29, 30, and 31. Summaries of intersection LOS can be found in
Tables 18 and 19. The following section contains a more detailed discussion of each intersection
operating at LOS F for any of the peak periods.
Corridor LOS was also calculated for designated corridors in the Southcenter area. These results are
shown in Figure 32.
TABLE 18 - 2030 AM AND PM PEAK INTERSECTION LEVEL OF SERVICE
ID
Location
AM Peak
PM Peak
Delay
(seconds)
LOS
Delay
(seconds)
LOS
Signalized
1
S. 180th Street / Southcenter Parkway
21.4
C
131.5
F
2
S. 180th Street / Andover Park W
33.6
C
94.7
F
3
S. 180th Street / Andover Park E
8.8
A
30.4
C
4
S. 180th Street / Sperry Drive
11.0
B
26.9
C
5
S. 180th Street / West Valley Highway
48.6
D
>150
F
6
S. 180th Street / 72nd Avenue S.
6.4
A
15.6
B
7
Saxon Drive / Andover Park E
6.6
A
9.6
A
9
Minkler Boulevard / Southcenter Parkway
3.1
A
17.3
B
10
Minkler Boulevard / Andover Park W.
13.1
B
30.7
C
11
Minkler Boulevard / Andover Park E.
10.6
B
17.0
B
12
S. 168th Street / Southcenter Parkway
14.6
B
26.3
C
13
Strander Boulevard / Southcenter Parkway
17.9
B
46.3
D
14
Strander Boulevard / Southcenter Mall SW Driveway
3.1
A
22.4
C
15
Strander Boulevard / 61st Place S.
22.6
C
25.9
C
16
Strander Boulevard / Andover Park W.
29.2
C
54.9
D
17
Strander Boulevard / Andover Park E
30.0
C
40.5
D
18
Strander Boulevard / W Valley Highway
46.1
D
>150
F
75
FEHRt PEERS
City of Tukwila: Background Report for the Transportation Element of the Comprehensive Plan Update
Transportation Analysis and 2030 Improvement Recommendations
May 2012
TABLE 18 - 2030 AM AND PM PEAK INTERSECTION LEVEL OF SERVICE
ID
Location
AM Peak
PM Peak
Delay
(seconds)
LOS
Delay
(seconds)
LOS
19
Wig Boulevard / Southcenter Parkway
3.7
A
11.5
B
21
Klickitat Drive / Southcenter Parkway
16.2
B
28.9
C
22
1 -5 Exit 153 Off-ramp / Southcenter Parkway
14.2
B
61.5
E
23
Baker Boulevard / Andover Park W
5.0
A
15.1
B
24
Baker Boulevard / Andover Park E
5.6
A
11.7
B
27
Longacres Way / W Valley Highway
10.8
B
18.8
B
29
Tukwila Parkway / 61st Avenue S
18.9
B
35.3
D
30
Tukwila Parkway /1-405 NB On -ramp
5.6
A
16.4
B
31
Tukwila Parkway / Andover Park W
11.7
B
17.6
B
32
Tukwila Parkway / Andover Park E
23.6
C
23.9
C
33
1 -405 NB Ramps / W Valley Highway
59.9
E
48.2
D
34
Southcenter Boulevard / W Valley Highway
42.3
D
111.6
F
35
1 -405 SB Ramps /Fort Dent Way / Interurban Avenue S
38.9
D
57.0
E
36
Southcenter Boulevard / 66th Avenue S
18.3
B
120.9
F
38
Southcenter Boulevard / 61st Avenue S
18.5
B
71.1
E
39
Southcenter Boulevard / Macadam Rd. S
7.4
A
11.8
B
41
Southcenter Boulevard /1-5 SB Off -ramp
16.3
B
29.5
C
48
Southcenter Boulevard / 42nd Avenue S
16.9
B
29.0
C
49
Southcenter Boulevard / Tukwila International
Boulevard
23.9
C
58.9
E
50
S 150th Street / 42nd Avenue S
7.0
A
6.4
A
51
S 152nd Street / Tukwila International Boulevard
17.1
B
29.1
C
54
S 144th Street / Tukwila International Boulevard
18.5
B
35.5
D
55
S 144th Street / 42nd Avenue S
7.1
A
11.4
B
61
58th Avenue S / Tukwila International Boulevard
8.9
A
8.9
A
62
52nd Avenue S / Interurban Avenue S
10.1
B
12.3
B
64
1 -5 SB Off -ramp / Interurban Avenue S
17.7
B
32.9
C
65
48th Avenue S / Interurban Avenue S
11.7
B
13.7
B
66
SR -599 Off-ramp / Interurban Avenue S
23.1
C
21.2
C
67
Gateway Drive / Interurban Avenue S
26.3
C
29.5
C
68
SR -599 NIB On -ramp / Interurban Avenue S
7.9
A
23.7
C
69
42nd Avenue S / Interurban Avenue S
35.4
D
36.7
D
77
S 133rd Street / SR 599 Ramps
8.2
A
7.8
A
79
S 116th Way / Tukwila International Boulevard
24.5
C
38.4
D
81
E Marginal Way / Interurban Avenue S
28.3
C
27.4
C
85
S 112th Street / Tukwila International Boulevard
12.1
B
37.1
D
86
Boeing Access Road / E Marginal Way
26.8
C
63.4
E
FEHR PEERS
City of Tukwila: Background Report for the Transportation Element of the Comprehensive Plan Update
Transportation Analysis and 2030 Improvement Recommendations
May 2012
TABLE 18 - 2030 AM AND PM PEAK INTERSECTION LEVEL OF SERVICE
ID
Location
AM Peak
PM Peak
Delay
(seconds)
LOS
Delay
(seconds)
LOS
87
Boeing Access Road/1-5 SB Off-ramp
32.5
C
20.7
C
88
Boeing Access Road / Martin Luther King Way
40.0
D
61.4
E
90
S 102nd Street / E Marginal Way
2.9
A
5.6
A
91
S Norfolk Street / E Marginal Way
5.8
A
6.7
A
92
S 96th PI. / E Marginal Way
4.5
A
12.8
B
93
S 124th Street / E Marginal Way
6.3
A
18.2
B
96
S 200th Street / Orillia Road S
22.0
C
18.1
B
97
S 200th Street / Southcenter Parkway
61.7
E
48.9
D
Unsignalized
37
Southcenter Boulevard / 65th Ave S
12.0
B
17.5
C
40
Southcenter Boulevard / 1 -405 SB Off-ramp
22.7
C
>150
F
42
SR 518 WB On -ramp /Klickitat Drive
7.1
A
11.3
B
43
SR 518 EB Off -ramp / Klickitat Drive
13.7
B
26.2
D
45
1 -5 SB On -ramp / Klickitat Drive
8.2
A
17.5
C
47
S 160th Street / 42nd Avenue S
11.1
B
24.3
C
52
Military Road S / 152nd Street S
7.9
A
10.0
A
56
S 144th Street / Macadam Road S / 51st Ave S
8.6
A
17.6
C
57
S 144th Street / 53rd Avenue S
10.2
B
19.9
C
58
S 144th Street / Macadam Road S
10.5
B
16.3
C
63
1 -5 NB On -ramp / Interurban Avenue S
12.8
B
13.5
B
70
S 124th Street / 42nd Avenue S
12.7
B
26.1
D
74
S 130th Street / E Marginal Way
16.0
C
29.3
D
75
S 130th Street / Macadam Rd S
9.8
A
11.2
B
78
128th Street S / E Marginal Way
14.9
B
12.4
B
82
S 116th Street / E Marginal Way
27.8
D
36.6
E
84
S 112th Street / E Marginal Way
21.1
C
29.8
D
Fehr & Peers, 2010.
FEHRt PEERS
City of Tukwila: Background Report for the Transportation Element of the Comprehensive Plan Update
Transportation Analysis and 2030 Improvement Recommendations
May 2012
Table 18 provided level of service for 2030 weekday AM and PM peak hours. Due to the density of retail
and commercial land uses in the Southcenter area, 2030 Midday and Saturday peak hour analysis was
also calculated for signalized intersections in this area. Results from this analysis are provided as Table
19.
TABLE 19 - 2030 MIDDAY AND SATURDAY INTERSECTION LEVEL OF SERVICE
ID
Location
Mid -day
Saturday
Delay
(seconds)
LOS
Delay
(seconds)
LOS
Signalized
1
S 180th Street /Southcenter Parkway
103.8
F
144.5
F
9
Minkler Boulevard / Southcenter Parkway
62.0
E
110.5
F
12
S 168th Street / Southcenter Parkway
13.8
B
6.1
A
13
Strander Boulevard / Southcenter Parkway
28.7
C
72.1
E
14
Strander Boulevard / Southcenter Mall SW
Driveway
11.3
B
39.2
D
15
Strander Boulevard / 61st Place S
25.0
C
34.9
C
16
Strander Boulevard / Andover Park W
49.5
D
76.9
E
19
Wig Boulevard / Southcenter Parkway
14.8
B
7.0
A
21
Klickitat Drive / Southcenter Parkway
24.8
C
61.1
E
22
1 -5 Exit 153 Off-ramp / Southcenter Parkway
23.6
C
122.8
F
23
Baker Boulevard / Andover Park W
21.0
C
26.0
C
29
Tukwila Parkway / 61st Avenue S
37.5
D
53.6
D
30
Tukwila Parkway / 1 -405 NB On -ramp
15.8
B
47.0
D
31
Tukwila Parkway / Andover Park W
16.3
B
23.1
C
38
Southcenter Boulevard / 61st Avenue S
57.5
E
>150
F
Fehr & Peers, 2010.
FEHRt PEERS
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CITY OF TUKWILA -
2030 AM PEAK HOUR INTERSECTION LEVEL OF SERVICE
FIGURE 29
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596th-
LEGEND
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Signalized Intersection
Unsignalized Intersection
Intersection Level of Service
❑ A - B • E
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D
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J..+
111-
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CITY OF TUKWILA -
2030 PM PEAK HOUR INTERSECTION LEVEL OF SERVICE
FIGURE 30
1
LEG
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END
Level of Service
❑ A -B ■ E
❑ C E F
D
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Level-- • Level
of Service of Service
0
N
NOT TO SCALE
FEHR' PEERS
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CITY OF TUKWILA -
2030 MIDDAY AND SATURDAY
INTERSECTION LEVEL OF SERVICE
FOR SOUTHCENTER AREA
FIGURE 31
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Corridor
Average
LOS
Average
Delay
1
D
35
2
D
54
3
C
29
4
C
30
5
E
61
6
F
92
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LEGEND
Level of Service
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XX Corridor ID
N
NOT TO SCALE
CITY OF TUKWILA -
F E H R PEERS 2030 SOUTHCENTER
CORRIDOR LEVEL OF SERVICE
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City of Tukwila: Background Report for the Transportation Element of the Comprehensive Plan Update
Transportation Analysis and 2030 Improvement Recommendations
May 2012
CONGESTED INTERSECTIONS
The following intersections are anticipated to operate at LOS E or F for one or more of the four peak
periods analyzed.
Signalized Intersections
Intersection 1: S 180th Street & Southcenter Parkway
The signalized intersection of S 180th Street and Southcenter Parkway is expected to operate at LOS F
for PM, midday, and Saturday peak periods in 2030. While this intersection performed well under existing
conditions, the new employment and housing growth forecasted in Tukwila South is expected to
substantially increase the demand through the intersection. The current split phase signal operation of the
intersection is not conducive to the anticipated high volume.
Intersection 2: S 180th Street & Andover Park West
The signalized intersection of S 180th Street and Andover Park West is expected to operate at LOS F
during the PM peak hour. With the anticipated growth in Tukwila South, a larger demand is expected to
be placed on the S 180th Street corridor. New development is also expected along Andover Park West
south of S 180th Street, increasing demand on the northbound approach to the intersection. These
increases in demand are responsible for the poor LOS.
Intersection 5: S 180th Street & W Valley Highway
The signalized intersection of S 180th Street and W Valley Highway is expected to operate at LOS F
during the PM peak hour. This intersection was estimated to operate at LOS F under existing conditions
as well. With the anticipated growth in Tukwila South, an even greater demand is expected to be placed
on this intersection.
Intersection 9: Minkler Boulevard & Southcenter Parkway
The signalized intersection of Minkler Boulevard and Southcenter Parkway is forecast to operate at LOS
F during the Saturday peak hour in 2030. Increases in the demand of the northbound through,
southbound through, and westbound left movements contribute to the poor LOS. The increase in demand
at this intersection, along with the Southcenter Parkway corridor is due to the development along
Southcenter Parkway south of S 180th Street.
Intersection 18: Strander Boulevard & W Valley Highway
The intersection of Strander Boulevard and W Valley Highway is expected to operate at LOS F during the
PM peak hours in 2030. The inclusion of the Strander Boulevard extension from W Valley Highway to
Oakesdale Avenue in the 2030 model leads to increased demand on this intersection, resulting in poor
LOS.
Intersection 22: 1 -5 Exit Off -ramp & Southcenter Parkway
The signalized intersection of the 1 -5 northbound off -ramp and Southcenter Parkway is projected to
operate at LOS F during the 2030 Saturday peak hour. Increased volumes on the north, south, and east
approaches result in poor operations at this intersection.
FEHRt PEERS
City of Tukwila: Background Report for the Transportation Element of the Comprehensive Plan Update
Transportation Analysis and 2030 Improvement Recommendations
May 2012
Intersection 34: Southcenter Boulevard & W Valley Highway
The signalized intersection of Southcenter Boulevard and W Valley Highway would continue to operate at
LOS F during the PM peak in 2030, as it does under existing conditions. With increases in demand at the
intersection in all directions forecasted for 2030, operations are expected to remain at LOS F.
Intersection 36: Southcenter Boulevard & 68th Avenue S
The intersection of Southcenter Boulevard and 68th Avenue S is expected to operate at LOS F during the
PM peak hour in 2030. An increase in volume on the northbound approach results in additional
intersection delay. This increase in volume results from the forecasted growth in employment and housing
in the Southcenter area.
Intersection 38: Southcenter Boulevard & 61st Avenue S
The intersection of Southcenter Boulevard and 61st Avenue S is forecast to operate at LOS E during the
PM peak hour and LOS F during the Saturday peak hour in 2030. Due to the increase in employment and
housing in the Southcenter area and Tukwila South, traffic demand at this intersection is expected to
increase. The vehicle queues from the Tukwila Parkway and 61st Avenue S intersection would also
contribute to the LOS F operations.
Unsignalized
Intersection 40: Southcenter Boulevard & 1 -405 SB Off -ramp
The intersection of Southcenter Boulevard and the 1 -405 SB off -ramp is expected to operate at LOS F
during the PM peak hour in 2030. The poor LOS can be attributed to the northbound left turn movement.
The forecasted growth in demand of the eastbound movements on Southcenter Boulevard cause more
conflicts with the northbound left movement resulting in increased delay.
PEDESTRIAN AND BICYCLE CONDITIONS
Section 1 of this report identified a number of pedestrian and bicycle facilities throughout the City that
operated poorly under existing conditions. In some cases, the poor operations were caused by rough
pavement or other issues that could be addressed through routine maintenance. However, in other cases,
the poor operations were caused by the lack of an adequate facility for bicycles or pedestrians. Since
pedestrian and bicycle LOS is dictated by the physical space available to pedestrians or bicycles (as
opposed to estimated flows), the findings in the Existing Conditions Analysis are similar to what would be
determined under 2030 conditions (assuming no improvements were made).
FEHRt PEERS