What is a violation involving disregarding traffic signs?

Disregarding traffic signs specifically pertains to actions that disregard the directives given by these signs, particularly stop or yield signs. Failing to obey a stop sign or yield sign can lead to dangerous situations, including accidents, because these signs are placed to control traffic flow and ensure safety at intersections. When a driver does not stop at a stop sign, they may collide with other vehicles or pedestrians, leading to serious consequences.

The option discussing following too closely does not involve traffic signs directly, but rather indicates a driving practice that can lead to accidents. Unsafe backing on a highway is more related to the safety of maneuvering a vehicle rather than the violation of traffic control devices. Similarly, a mistaken lane change refers to a driving error that does not specifically involve ignoring a traffic sign. All these options present different scenarios that can lead to violations, but the clear violation concerning traffic signs is the failure to obey stop or yield signs.