Traffic Volume


Traffic Counts - Graduated

Traffic Counts (County-maintained roads only)

Traffic Volume - Graduated

Traffic Volume (County-maintained roads only)

Alternate Views of the Map

Map Information

The above maps displays traffic counts (point features) and traffic volume (linear features) associated with County-maintained roads. NOTE: Roads that are within city limits, state highways, or private property do not belong to the County-Maintained Road System.


Traffic Counts

A traffic count is a field survey that measures of the number of vehicles passing a specific point on a road within a given amount of time, in order to determine the volume of traffic, or Traffic Volume. On the above map, traffic counts are displayed as red point features.

Traffic Volume

Traffic volume refers to the number of vehicles that pass a specific point or stretch of road within a given amount of time. It is typically expressed as Average Daily Traffic (ADT), which is the number of vehicles per day.

On the above map, traffic volume is displayed as red line features (with graduated thickness based on average volume). For any stretch of road defined on the map, Average Volume is derived from all weekday traffic counts that have been taken within along stretch of road.

Contact Information

Business Hours
Monday – Friday
8:00 AM – 5:00 PM
Contact us by Phone
Office Location
La Plaza B
2300 County Center Drive
Suite B 100
Santa Rosa, CA 95403
38.462023, -122.725381

Interactive Maps

Sonoma County Interactive Maps


Thematic interactive maps for Sonoma County