A Siren Behind You in Six Lanes

Yielding to an emergency vehicle is simple on an empty road and genuinely difficult on a full freeway. Doing it badly — braking hard in a fast lane, swerving into an occupied one, stopping where you are — creates a second emergency next to the first one. It is worth deciding how you will handle it before it happens, because there is no thinking time when it does.

The rule on a street: right, and stop

Vehicle Code section 21806 is specific. On the immediate approach of an authorized emergency vehicle sounding a siren and displaying a red lamp visible from the front, you must yield the right of way and immediately drive to the right-hand edge of the road, clear of any intersection, and stop until it has passed.

Two details do most of the work. Clear of the intersection means do not stop in the middle of one — pull through and then to the right, so the emergency vehicle has the intersection to work with. And wait. Emergency vehicles travel in groups more often than people expect, and the second one arrives exactly when everybody has decided it is over and started moving again.

On a freeway, predictability beats obedience

The freeway version is not the same maneuver, because stopping on the right-hand edge of a six-lane freeway at speed is not a safe act. What the driver behind you actually needs is a clear path and no surprises.

1. Work out where it is and where it is going before you touch anything. Mirror first.
2. Signal and move over steadily, toward whichever side opens the path. Do not brake hard in a fast lane.
3. If you cannot move, hold your lane and your speed. A predictable vehicle is easy to pass; an unpredictable one is the obstacle.
4. Never stop in a live freeway lane, which is the error that creates a chain of collisions behind you.

The most common mistake is panic braking in the left lane. The driver with the siren is trained to find a way through. What they need from you is not heroics — it is that you keep doing what you were already doing.

Hearing it in a modern car

Sirens are much harder to localize than they used to be, because a quiet, well-sealed cabin with the audio up removes most of the directional information. If you hear one and cannot place it, turn the audio down and drop a window a couple of inches. Then watch the traffic ahead: the brake lights and the shuffle of cars two hundred yards up are usually a better direction-finder than your ears.

The other rule: moving over for one already stopped

This is a separate requirement and it catches people out. Vehicle Code section 21809 requires a driver approaching a stationary emergency vehicle displaying flashing emergency lights on a freeway to move into a lane away from it if it is safe to do so, and to slow to a reasonable and prudent speed if changing lanes is not possible or safe. The requirement also covers tow trucks and Caltrans vehicles displaying flashing amber warning lights.

The reason is a person standing a few feet from a live lane, sometimes at night, sometimes in the rain, with their attention on a car rather than on you. Moving over one lane costs you nothing, and it is the single most protective thing a passing driver can do for them.

Do not follow one through traffic

The gap an emergency vehicle opens closes again immediately, and using it means arriving at speed into a scene full of people on foot, hoses, and vehicles parked at angles. It is also the behavior most likely to put you into a car that is still moving back into the lane it just vacated.

At the scene, and the secondary collision

The crash that happens at an incident scene is usually not caused by the incident. It is caused by a driver looking at it. Slow early, keep your eyes on the traffic ahead of you rather than on the lights, and do not stop to watch. If you are the person who stopped to help, park well past the scene rather than short of it, get everyone behind a barrier, and stay out of the live lanes.

While you are thinking about the roadside, it is worth checking whether your policy includes towing and roadside assistance — send us the declarations page and we will tell you what you already have.