Which vehicles are prohibited from using a road sign-posted like this?

This traffic sign means that vehicles with an actual axle weight exceeding 2 tonnes are not allowed to use this road. The sign specifically refers to the real, measured weight on a single axle when the vehicle is on the road, not the permissible (allowed) axle weight from the vehicle’s registration documents. This rule is important to protect the road surface and structures like bridges from potential damage caused by heavy loads. You selected answer 1, which is correct. Remember: Always check your actual axle loads, especially if carrying heavy cargo, to comply with such restrictions.