Which vehicles are allowed to drive on the road on which this sign is placed?

Explanation

Only buses and motorcycles are allowed to travel on this road.

Category signs work on the basis of "type of vehicle", not on its technical capability or speed. The sign names one or more classes, and those classes stay off the road; the other classes continue without any new condition. In this question, after the restriction is applied, only two classes remain on the road: buses and motorcycles; so the correct answer must name those two classes, not a broader heading and not a speed condition. The legislator's logic is clear: public transport and light vehicles neither impose a heavy load on the road structure nor take up much width, so the route stays open to them, while the general flow of cars is directed elsewhere.

The method for answering: first ask yourself which class the sign removes, then see which option states the remaining list precisely and completely.

• "Motor vehicles" is a general heading covering almost all cars; if everything were permitted, posting the sign would be pointless. • "All vehicles" contradicts the presence of a restricting sign; the sign is posted precisely to leave some of them out. • Speed capability is the criterion of signs concerning a minimum speed; here the criterion is the classification of the vehicle, not how many kilometres per hour it can do.

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