If you drive a tractor with a trailer, can you enter a road marked with this sign?

In the photo, sign B-18 "no entry for vehicles with an actual total mass over 2.5 t" stands at the entrance to a street, with a plate reading "Nie dotyczy służb miejskich, zaopatrzenia, straży pożarnej" (does not apply to municipal services, deliveries, fire service). You may enter here with a tractor and trailer only if the actual total mass of the combination does not exceed 2.5 t - answer C.

Sign B-18 prohibits the movement of vehicles whose actual total mass, that is the mass at a given moment including the load and people, is greater than the one shown on the sign; in the case of a vehicle combination, the combined mass counts. Answer A confuses the mass of the load alone with the mass of the whole combination, and answer B reverses the meaning of the prohibition. The plate exempts from the prohibition only vehicles of municipal services, deliveries and the fire service - the question does not indicate that you are driving for any of these purposes. In practice many tractors weigh over 2.5 t even without a trailer, so a combination will rarely fit within the limit - such a sign often protects a weak bridge or road surface. If you do not know the mass of the combination, look for a detour.

Legal basis: § 20 para. 4 of the Regulation on road signs and signals