Move over law — Missouri Permit Test

Approaching a stationary emergency vehicle showing red or red and blue lights, you must change into a lane not next to it if the road has at least four lanes with two or more running your way and it is safe to do so.

The worker beside that vehicle is standing in traffic. An empty lane between you and them is what keeps them alive.

make a lane change into a lane not adjacent to the stationary vehicle (if on a roadway having at least four lanes with not less than two lanes proceeding in the same direction as the approaching vehicle)

If changing lanes would be unsafe or impossible, you must proceed with due caution and reduce your speed, keeping it safe for road conditions.

There is always something to do. When the lane is not available, the speed is.

Proceed with due caution and reduce the speed of the vehicle, maintaining a safe speed for road conditions, if changing lanes would be unsafe or impossible.

The Move Over duty also applies to vehicles displaying amber, or amber and white, lights.

Tow trucks and highway crews work in the same lane of traffic as the police. The color of the light does not change the danger.

or vehicles displaying amber or amber and white lights

Violating the Move Over law is a Class A misdemeanor.

It is not a parking ticket. Missouri puts it in the same class as offenses that carry jail.

Violation of this section is a Class A misdemeanor.

The Move Over law requires motorists to yield the right-of-way and drive to a position parallel to and as far right as possible, then stop and remain there until the emergency vehicle has passed.

The statute spells out the whole maneuver: over, stopped, and staying stopped. Each part is one people leave out.

stop and remain in such position until such emergency vehicle has passed, except when otherwise directed by a police or traffic officer.

How many lanes must a road have before the lane-change duty applies at a stationary emergency vehicle?

At least four, with at least two running your way. The worker beside that vehicle is standing in traffic. An empty lane between you and them is what keeps them alive. Missouri Driver Guide, p.23: “make a lane change into a lane not adjacent to the stationary vehicle (if on a roadway having at least four lanes with not less than two lanes proceeding in the same direction as the approaching vehicle)”