Can you drive past this sign with a vehicle (without a trailer) having a gross vehicle mass of 3 t?

In the video you are driving along a cobbled street in an estate of detached houses, and on the right there is a prohibitory sign with the inscription "3t" - B-18 "no entry for vehicles with an actual total mass over 3 t". In a car without a trailer with an actual total mass of 3 t, you are allowed to drive past this sign. The answer is: yes.

The Regulation on road signs and signals states that sign B-18 means a ban on vehicles whose actual total mass is greater than the value shown on the sign; for a vehicle combination, the ban applies to their combined mass. The word "over" is the key: the ban covers vehicles heavier than 3 t, and a vehicle weighing exactly 3 t is within the limit. The actual total mass is the mass of the car with the driver, passengers, fuel and luggage at a given moment, not the mass in the vehicle registration certificate. Such signs stand where the road surface or a small bridge cannot carry heavy vehicles.

Legal basis: § 20 para. 4 of the Regulation on road signs and signals; Art. 2 point 55 of the Road Traffic Act (Prawo o ruchu drogowym)