What action is illegal when passing on the right?

Leaving the roadway to pass on the right is illegal because it poses significant safety risks. When a vehicle leaves the designated travel lanes, it increases the chance of losing control and encountering unexpected obstacles or hazards that are not present on the roadway. Additionally, it can endanger other drivers and pedestrians who may not anticipate a vehicle operating off the designated road.

Passing on the right should generally occur only in specific situations where it is legally permitted, such as when the vehicle ahead is turning left and there is enough space to do so safely without leaving the roadway. Other actions, such as signaling intentions, moving into the shoulder lane, or accelerating, can sometimes be part of lawful maneuvers under certain conditions, but leaving the roadway to pass is prohibited because it compromises safety and adherence to road regulations.