There is a 100 kms long bridge which has a carrying capacity of exactly 1000 tonnes only

If u r intelligent then solve this riddle:

There is a 100 kms long bridge which has a carrying capacity of  exactly 1000 tonnes only. 1 gram extra weight and the bridge will collapse. From the starting point of the bridge a truck of exact weight including the driver's weight and every other load of 1000 tonnes starts moving towards the other end. When it covers half the distance of the bridge I.e 50kms a crows sits on the truck. Will the bridge collapse?
Answer with reason.
Hint: Speed of truck is 50kmph and temperature 33°C..😎

For answer please click below link

http://www.quantfunda.in/2014/09/answer-1000-tonnes-truck.html