Upon encountering an emergency vehicle using lights and siren, what must all other vehicles do?

When encountering an emergency vehicle that is displaying lights and using a siren, all other vehicles must move to the right side of the road. This action allows the emergency vehicle to pass safely and quickly, ensuring that emergency responders can reach their destination without unnecessary delays.

Moving to the right creates a clear lane for the emergency vehicle, which is crucial during critical situations, such as medical emergencies, fires, or other urgent responses where every second counts. This practice is a fundamental part of traffic laws and safety protocols in many jurisdictions, instilling the importance of yielding to emergency vehicles to help preserve public safety.

While stopping completely can sometimes be advisable in certain scenarios, it is not a requirement in all cases, particularly on multi-lane roads where a driver may be able to move out of the way without stopping. Speeding up to pass or continuing to drive at a normal speed would interfere with the emergency vehicle's right of way and could result in dangerous and potentially life-threatening situations. Therefore, the most effective and law-compliant action is to move to the right.