Which vehicles are not allowed to use a road sign-posted like this?

This traffic sign means “No entry for motor vehicles except motorcycles.” It prohibits cars and trucks from using the road, but motorcycles are allowed. You answered correctly by selecting trucks and cars. This sign is used to keep roads free from larger motor vehicles to increase safety or reduce traffic, especially in residential or pedestrian zones. Remember: whenever you see this sign, only motorcycles and certain non-motorized vehicles may enter, not cars or trucks.