La Plaza B
2300 County Center Drive
Suite B 100
Road-Related Information and Downloadable Resources
View and download standard plans for new construction on County roads.
See traffic counts and speed surveys taken on Sonoma County roads.
Download the Postmile Book, a detailed listing of significant locations along County roads.
State, county, city or private? Find out which agencies are responsible for which roads.
About Measure M
Read about the Traffic Relief Act, passed by Sonoma County voters in 2004.