King County Signal Synchronization Program

1
King County Signal Synchronization Program
2
How it works

• Before
• After

3
Year 2001 Program

• 400,000 available in grants from county
• 14 proposals submitted
• County selected projects on 9 corridors covering
  80 signals
• Awards made to 7 cities
• Program is popular with cities and their traffic
  engineers.

4
Result Highlights

• Synchronizing signals on these 9 corridors saved
  nearly 600,000 annual person hours in the first
  year of operation

5
Afternoon Rush Hour Improvement

• Average travel time improvement - 7 to 51
• (30 seconds to 5 minutes per trip)
• Average travel speed improvement - 8 to 100
• (1 mph to 12 mph per trip)

6
Seattle Elliott Ave./15th Ave. W.approaching
Magnolia Bridge

• 7 travel time saved
• 8 travel speed improvement

7
Kirkland / King County NE 132ndlinking
Kingsgate with I-405

• 7 travel time saved
• 8 travel speed improvement

8
Burien / King Co Ambaum / 16th SWlinking White
Center and Burien

• 16 travel time saved
• 21 travel speed improvement

9
Kent Pacific Highway S.between Midway and
Federal Way

• 16 travel time saved
• 30 travel speed improvement

10
Kirkland Rose Hill areaNE 85th around I-405

• 25 travel time saved
• 33 travel speed improvement

11
Federal Way Pacific Highway S. from 16th Ave.
S. to S. 288th St.

• 27 travel time saved
• 36 travel speed improvement

12
Kent West Valley Highwayfrom downtown Kent to
Tukwila

• 30 travel time saved
• 47 travel speed improvement

13
Renton Grady Wayalong Renton Village and auto
row

• 35 travel time saved
• 53 travel speed improvement

14
Issaquah NW Sammamish Rd. / SE 56th along
Pickering Place off I-90

• 51 travel time saved
• 101 travel speed improvement

15
Year 2002 Grant Program

• 14 proposals submitted from 8 cities
• Awards recommended for 9 projects covering 83
  signals
• Jurisdictional equity every city that applied
  for eligible corridors has a program funded
• Funding total of 415,000

16
2002 Project Recommendation