This information comes from the Transport Agency's state highway traffic data collection system. This system is used to provide network usage statistics for approximately 1500 monitoring sites.
Our open data portal has a number of traffic count-related data sets, from quarter-hourly historic datasets to daily-updated datasets (API or CSV) and more.
Our interactive map displays traffic count sites and estimated traffic volumes for state highways.
Please note: Format has changed for 2012 to 2016. The data tables that were in the PDF have been moved to Excel format - available at the bottom of this page.
AADT = Annual average daily traffic