Congestion Monitoring
Speed as Percent of Speed Limit
2008
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Congestion Monitoring |
The City of Vancouver and Clark County collect PM peak period travel time for concurrency purposes along concurrency corridors. RTC has contracted to collect AM peak and additional PM peak travel time data in corridors not covered by the concurrency data collection effort. Travel speed is computed from the travel time data. It consists of utilizing the travel time and distance to calculate an average travel speed. Speed was then converted to a percent of posted speed for each of the congestion management corridors.
In the PM peak, arterials and freeways generally display lower percentages of speed compared to speed limit, due to higher congestion.
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