You must yield for emergency vehicles:

1. Under no circumstances.
2. When you see a flashing red or blue light or hear a siren. ✓
3. Only when other vehicles yield.
4. None of the above.

Answer: B. When you see a flashing red or blue light or hear a siren.

You must yield to emergency vehicles when you see a flashing red or blue light or hear a siren.

Why this is the answer

The handbook says you must give the right-of-way to police cars, fire trucks, ambulances, and other emergency vehicles that are sounding a siren, bell, or flashing red light. When that happens, pull to the right edge of the road and stop if traffic allows, or at least slow down and leave a clear path. The trigger for yielding is the emergency vehicle's warning signal, not what other drivers around you decide to do.

Why the other answers are wrong

• A. Under no circumstances. — The handbook directly requires you to yield to emergency vehicles using a siren, bell, or flashing red light, so it is not true that you never have to.
• C. Only when other vehicles yield. — Your duty to pull over or clear a path comes from the emergency vehicle's warning signal, not from whether the drivers around you yield first.
• D. None of the above. — The statement about flashing red or blue lights and sirens matches the handbook rule, so one of the listed choices is correct.

Remember it

Signal first, then move: light or siren means get right and stop.