Travel Time Analysis

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2007 Travel Time - Issaquah to Seattle Morning Commute

Current Traffic Conditions:
  Current Seattle Area Travel Times 
"Calculate Your Commute"
95% Reliable Travel Times 
Puget Sound Traffic Flow Map 
Live Traffic Cameras 

 Congestion Relief Projects Underway Congestion Relief Projects Completed 
  • I-5/James Street and Spring Street Ramp Terminals - Signal Rebuild
  • I-5/Downtown Seattle Sign Bridges
  • I-5/Pavement Reconstruction and Bottleneck Improvement Projects
  • I-90/Mercer Island Lid CCTV Replacement
    		•
  •  I-5/Spokane Street to I-90 Bridge Repair

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    Historic Traffic Conditions:
    Percentage of days when severe congestion occurs 
    The graph above displays the percentage of days on this particular route when traffic speeds fell below 35 MPH for the individual commute period (Morning and Evening). The darker line shows the trend for 2006, the lighter line shows the trend for 2004.
    I-90 at SR 900 in Issaquah
    The graph above displays the percentage of througphut capacity lost in a specific location on this commute. The lost throughput capacity is based on the individual calculation of the maximum number of vehicles per lane, per hour that can travel through at this point (indicated in paraenthesis below the graph title).The darker line shows the trend for 2006, the lighter line shows the trend for 2004.
    The location above has a traffic camera with a live image available online.

     Travel Time Analysis (Comparing 2004 to 2006) Issaquah to Seattle AM  Seattle to Issaquah PM
    Route I-90/I-5 I-90/I-5
    Peak time 7:40 AM 5:35 PM
    Length (in miles) 15.5 15.7
    Travel time at peak efficiency (in minutes) 18 18
    Travel time at posted speeds (in minutes) 15 16
    Average Peak Travel Time (Based on Peak Time) 2004 22 23
    Average Peak Travel Time (Based on Peak Time) 2006 26 23
    Change (∆) 18% 0%
    95% Reliable Travel Time 2004 30 35
    95% Reliable Travel Time 2006 39 37
    Change (∆) % 30% 6%
    Ratio of Peak Travel Time to Maximum Throughput Travel Time (MT³I) 2004 1.21 1.25
    Ratio of Peak Travel Time to Maximum Throughput Travel Time (MT³I) 2006  1.43 1.25
    Traffic Volume Peak Period +1% +1%
    Duration of Congestion 2004 (in hours: minutes) * *
    Duration of Congestion 2006 (in hours: minutes) 1:20 *
    Change (∆) (in minutes) 1:20 *

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