Anyone who wishes is able to drive a vehicle of up to 6,000 lb. onto the Brooklyn Bridge, right next to its cables and towers. What greater damage can be done

Anyone who wishes is able to drive a vehicle of up to 6,000 lb. onto the Brooklyn Bridge, right next to its cables and towers. What greater damage can be done on top of the bridge, carrying a backpack, than with a multi-ton vehicle on its deck?