Traffic Count Factoring

Traffic count data has been maintained along arterials for the period 1980 to present. Raw count data is collected by local jurisdictions, including WSDOT, 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