Final answer:
The transit priority signal looks like a white horizontal bar on a dark background (option a). Traffic signals enhance pedestrian safety and control vehicle speeds at intersections.
Step-by-step explanation:
The correct answer to the question 'When a transit priority signal is on top of your regular traffic signal, what does it look like?' is option (a) White horizontal bar on dark background. This type of signal gives priority to transit vehicles such as buses so they can move more quickly through traffic and improve service reliability.
Regarding pedestrian safety and vehicles speeding, traffic signals play a crucial role in urban areas. By controlling the flow of traffic and providing predictable opportunities for pedestrians to cross, signals contribute significantly to the reduction of incidents where pedestrians have to 'dodge' traffic. This enhances safety for everyone using the road, particularly in areas with high pedestrian activity.
Speed control is another important function of traffic signals. Signals force drivers to comply with the posted speed limit, as they must stop or slow down for red or yellow lights, rather than speeding through uncontrolled intersections.