What vehicle must always yield to all others on the road?

Emergency vehicles, which include any vehicle equipped with a siren, are mandated to yield to all other vehicles on the road when responding to emergencies. This is rooted in the priority given to these vehicles to ensure they can quickly and safely reach their destinations, which often involve public safety and emergency situations. When an emergency vehicle activates its siren, it signals its right of way, and other drivers are legally and morally obligated to yield.

Public buses, fire trucks, and construction vehicles may have specific yield requirements or may be required to yield in certain situations, but they do not carry the same blanket obligation to yield to all other vehicles at all times as emergency vehicles do. Thus, the presence of a siren on a vehicle establishes it as an emergency vehicle that must be yielded to without exception.