Final answer:
When emergency vehicles sound sirens and/or use flashing lights, a motorist should stop moving and become stationary till it passes by.
Step-by-step explanation:
When emergency vehicles sound sirens and/or use flashing lights, a motorist should stop moving and become stationary till it passes by. This allows the emergency vehicle to proceed safely and quickly through traffic. It is important for motorists to yield to emergency vehicles to ensure that they can reach their destination without delay. Running toward or alongside the ambulance would be unsafe and could impede the emergency vehicle's progress.