How many ft will it take a tractor trailer to make a stop?

A fully loaded (80000lbs) tractor trailer travelling at 55mph will take about 300 feet (the length of a football field)to come to a stop. An empty unit will take nearly 900 feet to stop. This may sound strange but an empty unit has much less weight spread over 18 wheels therefore creates less friction between the tires and road and is prone to skidding making the stopping distance much longer.