COURTESY speed display signs are reducing speed in Glen Forrest.
The Shire of Mundaring placed them along Thomas Road last month.
Shire President David Lavell said sign data from the August trial showed they had a positive effect on drivers.
“Based on the recorded data, speeding drivers were shown to reduce their speed, on average, by around 10 to 15 per cent when the sign was visible and flashing,” Cr Lavell said.
The signs were installed in areas covering westbound and eastbound traffic in a 60km/h section.
The average initial speed of westbound traffic approaching the sign was 61km/h with 55 per cent of vehicles exceeding the limit.
The traffic’s average final speed after encountering the sign was 54km/h.
Similarly the average initial speed for eastbound traffic was 55km/h with 24 per cent of vehicles exceeding the limit.
The average final speed recorded was 50km/h.
Cr Lavell said the trial’s success paved the way for the possible installation of the signs elsewhere in the Shire.
It is suggested the signs remain no longer than a month at one place because of driver complacency.
The Shire installed the signs through the WA Local Government Association’s RoadWise program.