This sign prohibits passage to...
A)trucks and vans only.
B)any vehicle whose maximum authorised mass exceeds the indicated value.
C)vehicles whose laden mass exceeds the indicated value.Correct
The sign in the question prohibits passage of vehicles whose laden mass exceeds the amount indicated in tonnes. If the vehicle, with or without load, weighs more than the indicated value, it may not pass. This sign applies to all vehicles.
On the other hand, the following sign prohibits passage to vehicles engaged in the transport of goods whose maximum authorised mass exceeds the value indicated by the sign, even when travelling empty.