Traffic Engineering

About Us

What We Do

Sonoma County Traffic Engineering personnel work to ensure that County roads are designed for optimal safety and efficiency. Citizens should keep in mind that all traffic control devices are operated and maintained by experienced engineering professionals, and must conform to state standards.

More Information

About Traffic Engineering

Traffic engineering is the branch of civil engineering that aims to achieve the safe and efficient movement of vehicles and pedestrians on roadways.

Traffic Control Devices

Devices, markings and other objects that control the movement of vehicle and pedestrian traffic are referred to as "traffic control devices." These include signs, pavement markings, traffic lights, and any other roadway features that regulate the movement of traffic. The placement of traffic control devices is carefully determined by professional traffic engineering staff.

Manual for Uniform Traffic Control Devices (MUTCD)

Citizens should keep in mind that all traffic control devices are operated and maintained by experienced engineering professionals, and must conform to state standards. To see standard design specifications for California traffic control devices, refer to the California Manual for Uniform Traffic Control Devices.

Traffic Impact Study Guidelines

Traffic impact studies must be conducted in accordance with County standards, as detailed in the Guidelines for Traffic Impact Studies PDF Document.

Traffic Data

Traffic counts, speed surveys, and speed limits can be viewed using our dynamic mapping applications, linked below:

Enforcement

Traffic enforcement falls under the heading of law enforcement, and is carried out by law enforcement agencies such as the California Highway Patrol (CHP), Sonoma County Sheriff's Department or City Police.

If you have observed a pattern of traffic safety violations in a specific area, you should not hesitate to contact law enforcement. When doing so, it is helpful to provide as much information as possible, such as the specific location(s), day(s), or time(s) of the day that the violations are observed.

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