Final answer:
The 'Do Not Pass' sign informs drivers not to overtake other vehicles, and when an ambulance approaches, drivers should pull over and stop. Safety on the roads can be enhanced with traffic signals in areas with speeding issues.
Step-by-step explanation:
The Do Not Pass sign is an important traffic control device that indicates to drivers that they should not overtake or pass other vehicles in the same direction in the area where the sign is posted. When encountering an emergency vehicle like an ambulance, the correct response is not listed among the provided options (a, b, c). Instead, drivers should safely pull over to the side of the road and come to a complete stop, allowing the ambulance to pass. This rule helps ensure safety on the roads and allows emergency vehicles to reach their destination as quickly and safely as possible.
Areas where there is an issue with vehicles exceeding the posted speed limit could benefit from additional traffic control measures such as a traffic signal. A signal timing system would enforce a stop-and-go pattern that would help manage the flow of traffic, preventing vehicles from speeding through an intersection.