Which vehicles must report to a weigh station?

Answer: B — All trucks or combination of trucks with a GVWR of 4,500 kg or higher

Trucks or combinations of trucks with a gross vehicle weight rating (GVWR) of 4,500 kg or higher are required to report to a weigh station. This includes commercial trucks as well as personal trucks that exceed the weight limit. Option A is incorrect because it states a GVWR limit that is lower than the actual requirement. Option C is incorrect because it limits the requirement to only commercial buses rather than all vehicles meeting the weight criteria. Option D is incorrect because it is too specific, only mentioning vehicles transporting hazardous materials. It does not include other types of heavy vehicles that are also required to report to a weigh station. Therefore, option B is the most accurate and comprehensive answer.