Laserfiche WebLink
speed studies show a significant reduction in the highest speeds on the roadway after <br />installation of the radar speed sign. The data also shows that the percent of drivers driving <br />within the pace speed (the consecutive 10 mph speed wherein the highest number of drivers <br />travel) increased, making speeds more uniform, which can also improve traffic safety. <br /> <br />The counts taken before the signs were installed were conducted in February when school was <br />in session. The counts taken with the signs in place were conducted in July. It is important to <br />note that with the radar speed signs in place, the average speed did move closer to the 35 <br />MPH speed limit by about 0.5 MPH. However it is not clear if this speed change occurred <br />due to the presence of the radar sign, or because in the summer time the 25 MPH "When <br />Children Are Present" speed limit does not apply and so the average speeds during the day <br />naturally increased slightly. <br /> <br /> Santa Rita Road at Amador High School <br /> Average Before Sign I Average After Sign <br /> Average Speed 33.47 MPH ~ 34.14 MPH <br /> 85th Percentile Speed 37.45 MPH ~ 38.54 MPH <br /> 10 mph Pace 25-35MPH ~ 30-40 MPH <br /> 10 mph Pace Total 7174.00 72.00% ~ 7010.00 76.17% <br /> /ehicles >= 55 mph 359.87 3.59% ~ 119.00 1.29% <br /> ~ehicles >= 60 mph 311.67 3.10% ~ 105.67 1.15% <br /> <br />Along West Las Positas Boulevard Hart Middle School, thespeed limit is 40 mph most of the <br />day, and 25 mph when students are coming or going from the school. Here, the before and <br />after speed studies show a significant reduction in the average, 85~ percentile and pace speeds <br />after the radar speed sign was installed. The data also shows that the percent of drivers <br />driving within the pace speed significantly increased, making speeds more uniform, which can <br />also improve traffic safety. <br /> <br /> West Las Positas at HART Middle School <br /> Average Before Sign Average After Sign <br /> ~,verage Speed 36.21 MPH 32.38 MPH <br /> 35th Percentile Speed 44.62 MPH 37.95 MPH <br /> 10 mph Pace 30-40MPH 25-35MPH <br /> 10 mph Pace Total 2798.75 48.06 % 3903.80 67.67 % <br /> <br />The cost of the solar powered radar speed signs is approximately $5,000 to $6,000, including <br />installation. The signs are easily moved and need only be mounted on a street light pole. <br />Staff recommends the continued use of these signs, not only on residential streets, but also on <br />residential collectors and arterials. <br /> <br /> SR:05:223 <br /> Page 8 of 9 <br /> <br /> <br />