Congestion Management Monitoring
Speed as Percent of Speed Limit
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Congestion Management Monitoring |
The City of Vancouver and Clark County collect travel time for concurrency purposes along many congestion management corridors. RTC collects additional travel time data in congestion management corridors that were not part of the concurrency data collection effort. The methodology for collecting the travel time data was consistent among agencies. Travel speed was computed by utilizing the travel time and distance information. Speed was then converted to a percent of posted speed for each of the congestion management corridors.
In general, facilities with at-grade intersections, display lower speed percentages. The speed percentages for freeway facilities are close to 100% of the posted speed limit. The eastern portion of Mill Plain, Southern portion of 164th Avenue, and eastern portion of SR-500 displays the lowest percentages of speed in the PM period.
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