The Riverside County board of supervisors established speed limits on five roads in unincorporated Murrieta and Winchester.
A 4-0 board of supervisors vote Oct. 1, with Karen Spiegel absent, approved a 40 mph speed limit for Calistoga Drive in unincorporated Murrieta from Murrieta Hot Springs to the intersection with Richmond Way and Greenhaven Way, a 40 mph speed limit for Promontory Parkway in Murrieta from the intersection with Richmond Way and Greenhaven Way to Pourroy Road, a 40 mph speed limit for Whisper Heights Parkway in Winchester between Elliot Road and the intersection with state Route 79 and Winchester Road, a 35 mph speed limit on Elliot Road in Winchester between Jean Nicholas Road and Pat Road, and a 35 mph speed limit on Pat Road in Winchester between Elliot Road and Pourroy Road.
In order for a speed limit to be enforceable by radar, a speed survey must show that the speed limit is within an adjacent 5 mph increment to the 85th percentile speed. The speed limit may be rounded either up or down from the 85th percentile speed. The speed limit may also be rounded down an additional 5 mph if findings are made that the road has conditions which would not be apparent to a motorist unfamiliar with the road. A speed survey may use the average of speeds taken at more than one location rather than having separate speed limits in the vicinity of each location.
All of the speed limits are new to the roads, although by state law the maximum allowable speed limit for a multi-lane highway of more than two lanes is 65 mph and the maximum speed limit for a two-lane highway is 55 mph. Calistoga Drive and Promontory Parkway are multi-lane highways while Whisper Heights Parkway, Elliot Road and Pat Road are two-lane highways.
Calistoga Drive between Murrieta Hot Springs and the intersection with Richmond Way and Greenhaven Way measures 1.14 miles. Speed surveys were taken 300 feet north of Central Park Drive and 1,000 feet north of Northgate Lane and the 85th percentile for the entire speed zone was 43.5 mph. During a two-year period the road had one reported collision for a rate of 0.45 per million vehicle miles.
Promontory Parkway from the intersection with Richmond Way and Greenhaven Way to Pourroy Road totals 0.80 miles. Speed surveys were taken 600 feet east of Whisper Oaks Road and 250 feet east of Pacific Park Drive. The 85th percentile speed at the two locations combined was 40.5 mph. The segment had no reported accidents in the most recent two-year period.
The distance of Whisper Heights Parkway between Elliot Road and the intersection with state Route 79 and Winchester Road is 0.40 miles. A single speed survey was taken 400 feet west of Grotto Hills Drive and produced an 85th percentile of 44 mph. The road segment had no recorded accidents in a two-year period.
Elliot Road measures 0.63 miles between Jean Nicholas Road and Pat Road. The speed surveys taken 1,000 feet north of Jean Nicholas Road and 400 feet north of Whisper Heights Parkway had an 85th percentile of 37 mph. That roadway had no reported collisions over a two-year period.
Pat Road totals 0.57 miles between Elliot Road and Pourroy Road. Speed surveys were taken 400 feet east of Blackberry Way and 500 feet west of Pourroy Road. The 85th percentile for the speed zone was 37.5 mph. One reported accident in two years created a collision rate of 1.92 per million vehicle miles.
Joe Naiman can be reached by email at email@example.com.