Travel Time Analysis

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2007 Travel Time - Seattle to SeaTac Evening 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/SR509 Corridor Completion and Freight Improvement
  • SR 518/SeaTac Airport to I-5?I-405 Interchange
  • SR 518/SR 509 Interchange Improvements
  • I-5 272nd Interchange Presrevation
  • I-5/James Street and Spring Street Ramp Terminal Signal Rebild
  • I-5/West Marginal Way Safety Improvements
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    Historic Traffic Conditions:
    Sea-Tac to Seattle Commute Route 
    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.
    The graph above displays an extended-daytime view of the percentage of days on this particular route when traffic speeds fell below 35 MPH for the daytime period (5 AM to 8 PM).The darker line shows the trend for 2006, the lighter line shows the trend for 2004. 
    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) SeaTac to Seattle AM Seattle to SeaTac PM
    Route I-5 I-5
    Peak time 7:45 AM 4:35 PM
    Length (in miles) 12.9 12.9
    Travel time at peak efficiency (in minutes) 15 15
    Travel time at posted speeds (in minutes) 13 13
    Average Peak Travel Time (Based on Peak Time) 2004 23 18
    Average Peak Travel Time (Based on Peak Time) 2006 27 19
    Change (∆) 17% 6%
    95% Reliable Travel Time 2004 31 24
    95% Reliable Travel Time 2006 37 28
    Change (∆) % 19% 17%
    Ratio of Peak Travel Time to Maximum Throughput Travel Time (MT³I) 2004 1.51 1.18
    Ratio of Peak Travel Time to Maximum Throughput Travel Time (MT³I) 2006  1.77 1.25
    Traffic Volume Peak Period 0% 0%
    Duration of Congestion 2004 (in hours: minutes) 2:15 *
    Duration of Congestion 2006 (in hours: minutes) 3:30 *
    Change (∆) (in minutes) 1:15 *

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