Original sentence: It may be a single light bulb visible to all, which flashes or stays on, or it may be a more sophisticated system where a spotlight is aimed in each direction.There are limitations inherent in some standard signal preemption systems, which rely on line-of-sight communication between the emergency vehicle and the receiver.This may lead to some intersections unnecessarily being impacted, and conversely other intersections not receiving the signal in time to clear the intersection for the approaching emergency vehicle
Edited sentence: However the Eliminator(tm) by Collision Control Communications does not have this limitation, find out more here:Collision Control Eliminator for Collision Avoidance and Traffic Signal Preemption.It may be a single light bulb visible to all, which flashes or stays on, or it may be a more sophisticated system such as that available with the OptiCom system from 3M where a spotlight is aimed in each direction.There are limitations inherent in the standard signal preemption systems, which rely on line-of-sight communication between the emergency vehicle and the receiver.This leads to some intersections unnecessarily being impacted, and conversely other intersections not receiving the signal in time to clear the intersection for the approaching emergency vehicle