How is this possible?

United States
July 3, 2007 12:33pm CST
A truck leaving New York for West Virginia weighs exactly two tons. About halfway through the trip, it crosses a bridge with a maximum capacity of two tons - any more weight on it and it'll instantly collapse. Just before it crosses, a two-pound tree limb falls on the roof of the truck and remains there while it crosses the bridge. Yet the bridge is intact. How is this possible?
2 responses
• United States
3 Jul 07
The truck would weigh less when it reaches the bridge at the halfway point due to fuel consumption.
• China
4 Jul 07
I agree with your answer!
• United States
5 Jul 07
Y'all are absolutely right.
@urbandekay (18308)
16 Jul 07
An alternative answer is that the truck carries a felled tree, a branch of which breaks, the limb that falls on the roof of the truck, hence net weight gain. all the best urban