At an intersection, a traffic light displays a red main light together with an illuminated green arrow in an additional right-turn section. How must a driver turning right proceed?

1. Turn right with absolute priority over all other traffic.
2. Turn right, but yield right of way to vehicles and pedestrians moving from other directions on their main green light.
3. Wait until the main circular signal turns green before executing the turn.
4. Sound the horn and proceed without checking cross traffic.