Final answer:
You should prepare to stop safely when a turn signal is about to change. Traffic signals are installed to enforce speed limits, improve pedestrian safety, and reduce accidents.
Step-by-step explanation:
When a turn signal is about to change, the appropriate action to take is c) You should prepare to stop if safe. This instruction means that as you approach the intersection, you need to be ready to bring your vehicle to a halt if the traffic conditions and the timing of the signal allow. If you are too close to the intersection and stopping would cause a hazard to the vehicles behind you, then you may continue through the intersection if it is safe to do so.
Installing traffic signals at intersections serves multiple functions, including enforcing the posted speeding limits, enhancing pedestrian safety, and ultimately reducing the number of accidents. Traffic signals regulate the flow of vehicles and provide safe crossing opportunities for pedestrians. The reduction in accidents is particularly significant in areas that experience frequent collisions, which in some tragic cases have led to fatalities.