PROGRAMS AND SERVICES
TRAFFIC CALMING PROGRAM
Level 4 Traffic Calming: DIVERTERS/FORCED TURN CHANNELIZATION

A diverter is a physical measure constructed diagonally across an intersection which forces traffic to turn right or left. Diverters eliminate through traffic and forces traffic onto sidestreets.

Diverters effectively reduce bypass traffic, however their effect on motorist speed depends on the length of the block. Other benefits are the improved pedestrian and motorist safety at the intersection by eliminating conflicts, areas provided for landscaping, and the maintained through access for bicycles.

The negative aspects .of diverters are that traffic is diverted to other roadways and thus, creates traffic issues on other roadways. Emergency vehicle access may also be diverted, increasing emergency response. The diversion may also prove to be a great inconvenience to some residents gaining access to their property. Additionally, the installation of diverters may require the reconstruction of the entire intersection and the acquisition of right-of-way from adjacent property owners.

While diverters offer tremendous traffic calming and aesthetic benefits to a roadway, the entire neighborhood is affected by this type of traffic calming measure.

IMPLEMENTATION

• Define the "neighborhood" to identify potential affected residential roadways. If other roadways will be severely impacted, 90% concurrence from property owners on those impacted roadways must be received for the installation of the diverter at the study intersection.
• Identify primary emergency response routes
• Identify AC Transit service routes
• Design must accommodate turning of large vehicles
• Landscaping should consider maintenance and sight distance issues
• Requires Board of Supervisors Resolution