Congestion Management Monitoring
Traffic counts collected for the CMS include several locations that also classify vehicles according to the number of axles. Trucks are defined as vehicles with more than two axles, such as typical tractor/trailer rigs, travelling on the roadway during the peak period. This is a measure of trucks as a percentage of all vehicles travelling on the roadway.
Overall, the freeway facilities and SR-501 accessing the Port of Vancouver display the highest percentage of truck volumes during the PM peak period. The exception to this is on SR-500, which has truck percentages similar to major arterials, such as Andresen Road and 164th Avenue. SR-14, I-5 and I-205 corridors have truck percentages of 5% or higher. Fourth Plain Boulevard/SR-501 from I-5 to the Port of Vancouver has the highest percentage at 17.9% of PM peak vehicle volumes. (Count was taken prior to the completion of the Mill Plain Extension). I-5 North and I-205 Central also have significant truck percentages (13.8% and 10.3%).
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