What does axle weight refer to?

Answer: B — Weight transmitted to the ground by one axle or one set of axles

Axle weight refers to the weight transmitted to the ground by one axle or one set of axles. This is different from the overall weight of a vehicle, which includes the weight of the vehicle itself as well as any passengers or cargo. Option A is incorrect because it refers to the weight transmitted to one tire, not the ground. Option D is incorrect because it only considers the weight of the vehicle and passengers, not the weight transmitted to the ground.