A range of technologies has been successfully implemented in local and overseas cities to improve the response time of emergency vehicles. These technologies range from simple manually operated pre-emption of signal phases adjacent to a fire or police station to advanced GPS‑based technologies. The response times of emergency vehicles have been shown to be reduced by 14 to 25%. Road crashes could also be reduced by up to 90%.
It is worth noting an important aspect of the low-cost, SCATS-based (manual) pre‑emption scheme along a route to facilitate the progression of emergency vehicles to an incident site. It requires close phone or radio contact to a traffic management centre to avoid unplanned congestion along the route, but its use is always an improvement on the absence of any EVP system.