Transportation Data, GIS & Modeling


Short Count Factoring Guide

This guide provides a general overview of traffic counting programs, as well as a more detailed discussion of suggested practice in relation to short duration traffic count field and office techniques. The intent is to encourage high standards and uniform practices among local traffic counting programs within the State of Washington so that an accurate representation of traffic on our public roadways is available to all interested parties.

Short Count Factoring Guide May 2018 (pdf 2.0 mb)

It is an informational guide only, and does not constitute a specification or a statement of required practice.

Additional Resources: FHWA Traffic Monitoring Guide