Final answer:
Maintain a safe distance and stop your vehicle when an emergency vehicle approaches. Understanding the Doppler shift in a siren's frequency helps determine its movement, aiding in yielding the right of way. In emergencies, actions like breaking a red light may be morally considered if it serves a greater good.
Step-by-step explanation:
When encountering emergency vehicles, such as ambulances, it is crucial to maintain a safe distance and allow them to pass. The best course of action is to stop your vehicle and become stationary until the emergency vehicle has passed. This is question 'g' mentions finding a safe distance to cross, which can be related to being aware of oncoming emergency vehicles.
In the situation where you hear a Doppler shift in an ambulance's siren, it helps in determining when the ambulance is getting closer or moving away from you. In such cases, it's essential to pull over safely to let the ambulance through, ensuring a clear path for emergency services.
Relating to the GRASP CHECK, the frequency observed will most closely match the actual siren frequency when the ambulance is directly in front of you ('c'). Lastly, in an urgent situation, such as a pregnant woman about to deliver, the 'RU rule' suggests that it may be morally justifiable to go through a red light if it results in greater utility, such as getting to the hospital swiftly in an emergency.