PROGRAMS AND SERVICES
TRAFFIC CALMING PROGRAM
Level 3 Traffic Calming: HALF (ONE-WAY) ROADWAY CLOSURE

A half (one-way) roadway closure is a physical measure constructed to allow one-way traffic only at an intersection. This is similar to the chicane described in the level 3 traffic calming measures except that this device allows only one way traffic.

Half closures (which may also provide potential areas for landscaping) effectively reduce bypass traffic in one direction. Motorist speeds in the direction of unrestricted traffic may be unaffected. However, since this is used at an intersection, STOP controls may apply.

Disadvantages to half closures include the diversion of traffic to other roadways, partial emergency vehicle impediment, and the inconvenience to residents.

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 half (one-way) roadway closure 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