2006

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2006 Congestion Report - Seattle to SeaTac

The two graphs below display the percent of days on each route when traffic speeds fell below 35 mph. The darker line shows data for 2005. The lighter line shows data for 2003.


SeaTac to
Seattle AM 		SeaTac to Seattle PM
Route I-5 I-5
Peak time 7:40am 5:15 pm
Length 12.9 miles 12.9 miles
Travel time at posted speeds 13 minutes 13 minutes

Average Peak Travel Time 2003

23 minutes 18 minutes
Average Peak Travel Time 2005 25 minutes 19 minutes
Average Peak Travel Time Change, 2003-2005 9% 6%
95% Reliable Travel Time 2003 29 minutes 22 minutes
95% Reliable Travel Time 2005 38 minutes 26 minutes
95% Reliable Travel Time Change, 2003-2005 31% 18%
Ratio of Peak Travel Time to Maximum Throughput Travel Time (MT³I) 2003 1.5 1.2
Ratio of Peak Travel Time to Maximum Throughput Travel Time (MT³I) 2005 1.6 1.3
Traffic Volume Peak Hour Change -1% -1%
Duration of Peak Period, 2003 (hours:minutes) 2:25 *
Duration of Peak Period, 2005 (hours:minutes) 3:15 *
Change (in minutes) 50 minutes *

* = Speeds did not drop below 35 mph for any siginificant amount of time for this route.

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