Keep your distance slogan

When the car is driving at a high speed, it needs to keep the original high-speed state because of inertia. If the speed is too fast, when the car brakes in an emergency, the braking distance required by the car will become longer, which is easy to cause traffic accidents. Therefore, "for safety, please keep the distance between cars" is to remind the driver behind you not to drive too fast, and at the same time to prevent rear-end accidents due to emergency braking.

So choose AC.