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Traffic count data has been maintained along arterials for the period 1980 to present. Raw count data is collected by local jurisdictions, including Washington State Department of Transportation, Clark County, City of Vancouver, and City of Camas. RTC applies the factors shown below to the raw count data to represent the average day of the average month.
Monthly Factors
State Facilities Local Facilities January 1.119 1.117 February 1.063 1.073 March 1.019 1.017 April 0.994 0.983 May 1.008 0.967 June 0.957 0.945 July 0.928 0.945 August 0.930 0.952 September 0.967 0.951 October 1.006 0.966 November 1.020 1.050 December 1.032 1.052 Daily Factors
State Facilities Local Facilities Monday 1.051 1.035 Tuesday 1.035 1.016 Wednesday 1.019 1.008 Thursday 0.999 1.008 Friday 0.911 0.940