Travel Time Analysis

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2007 Travel Time - Seattle to Bellevue via SR 520 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-405 - NB NE 8th Street to SR 520 Braided Crossing
  • SR 520 - Bridge Replacement and HOV Project
    		•
  •  I-405 - South Bellevue Widening
  • I-405 - NE 10th Street Bridge Crossing
  • SR 520: Westbound off-ramp to NE 51st Street and westbound off-ramp to 148th Avenue NE

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    Historic Traffic Conditions:
    Percentage of days when speeds dropped below 35 MPH (Severe Congestion)
    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. 
    Percentage of days whe a loss of throughput capacity occured for this location.
    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) Seattle to Bellevue AM  Bellevue to Seattle PM
    Route I-5/SR 520/I-405 I-5/SR 520/I-405
    Peak time 8:40 AM 5:20 PM
    Length (in miles) 10.1 10.5
    Travel time at peak efficiency (in minutes) 12 12
    Travel time at posted speeds (in minutes) 11 10
    Average Peak Travel Time (Based on Peak Time) 2004 20 25
    Average Peak Travel Time (Based on Peak Time) 2006 23 26
    Change (∆) 15% 4%
    95% Reliable Travel Time 2004 29 33
    95% Reliable Travel Time 2006 33 38
    Change (∆) % 14% 15%
    Ratio of Peak Travel Time to Maximum Throughput Travel Time (MT³I) 2004 1.69 2.03
    Ratio of Peak Travel Time to Maximum Throughput Travel Time (MT³I) 2006  1.94 2.11
    Traffic Volume Peak Period 0% -1%
    Duration of Congestion 2004 (in hours: minutes) 2:30 4:30
    Duration of Congestion 2006 (in hours: minutes) 2:50 4:40
    Change (∆) (in minutes) 0:20 0:10

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