Final answer:
When drivers are passing vehicles traveling in the same direction, they should pull over for emergency vehicles like ambulances, and when passing slower traffic, they should do so safely without exceeding the speed limit.
Step-by-step explanation:
When drivers encounter vehicles they are passing which are traveling in the same direction, it's important to practice safe driving habits to avoid accidents. For instance, when you hear a Doppler shift in an ambulance siren, it indicates that the ambulance is approaching. You need to pull over and allow the emergency vehicle to pass. If you're driving in a busy area, like a main artery through a city's business district, and want to pass a vehicle that is traveling below the speed limit, ensure it is safe to do so, then pass the vehicle without exceeding the speed limit, as speeding could result in an unsafe situation, much like a car speeding through an intersection could if there were no traffic signal to slow them down.