The "overall height" of a vehicle is measured:

1. AFrom the height of the bed floor to the highest point of the truck.
2. BFrom the road surface to the highest point of the vehicle, with all its accessories, when the vehicle is not loaded.
3. CFrom the road surface to the highest point of the vehicle, with all its accessories, when it is loaded.
4. DFrom the road surface to the height of the roof of the driver's cab.

Pick an answer to test yourself