Final answer:
Emergency vehicles communicate with drivers blocking their path using sirens and lights, signaling them to pull over and let the emergency vehicle pass.
Step-by-step explanation:
Emergency vehicles need to communicate with drivers blocking their path in order to inform them of the emergency and request them to move aside.
They do this through the use of sirens and lights.
The sirens produce a distinct sound that can indicate the proximity of the emergency vehicle, while the flashing lights are highly visible and serve as a visual signal.
Drivers who hear or see an emergency vehicle approaching should pull over to the side of the road and stop to allow the emergency vehicle to pass safely.
This helps ensure that the emergency responders can reach their destination quickly and without any hindrance.