A sign shows 'RIGHT TURN ONLY' with a white background and black letters. What must a driver do?

'RIGHT TURN ONLY' is a REGULATORY SIGN — white background, black text. It requires the driver to turn right. It does not say 'may turn right' or 'right turns permitted.' The word 'ONLY' removes all other options. This is mandatory, not advisory. Common locations: right-turn lanes approaching an intersection; exit ramps; one-way streets. The violation: proceeding straight in a 'RIGHT TURN ONLY' lane is both a traffic violation and a dangerous maneuver (crossing through a lane of vehicles turning right while you proceed straight creates a collision risk). These lanes are marked with both signs AND pavement arrows — look for both before choosing a lane.