An ambulance with lights and siren is approaching on the opposite side of a divided highway, separated from you by a raised median. What is required of you?

Why C is correct

On a divided highway with a physical median, an emergency vehicle operating on the opposite carriageway is not on your roadway, and drivers on your side are not required to stop for it. The duty to yield applies when the emergency vehicle is on or crossing your part of the road. What never changes is general alertness: keep your lane position steady, watch what vehicles around you do, because the mistake to guard against is a panicked driver on your side braking or swerving for a siren that was never in their path.

Why the other options are wrong

A. You must slow to half the posted limit and switch on your hazard lights

There is no half-speed rule for emergency vehicles on the opposite carriageway, and hazard lights signal a disabled or stopped vehicle, not a listening driver. Using them while moving normally misleads everyone around you.

B. You must immediately move into the rightmost lane in every case

Moving right can be the correct response when the emergency vehicle is on your carriageway, but as a blanket reaction to any siren it just rearranges traffic for no reason. On a median-divided highway the correct action is usually to hold your lane and keep the flow predictable.

D. You must pull over and stop, because emergency vehicles always claim the whole highway

Stopping for a siren that is physically separated by a median is itself a hazard: it creates an unexpected obstacle for traffic behind you. The pull-over duty is tied to the emergency vehicle being on your roadway, not to hearing it.

On the road

You are in the left lane of I-25 through the metro area when a med-evac ambulance passes the other way, siren pounding across the median. The car next to you brakes hard anyway. You keep rolling steadily with a generous gap, watching that driver, because the real risk in this scene is not the ambulance you cannot reach — it is the SUV beside you inventing an emergency of its own.

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