VIDEO/PHOTO: The Pennsylvania Turnpike (Interstate 476) northbound in Macungie was closed after a multiple-vehicle crash. The crash happened in a construction zone of the turnpike around 6 a.m. Friday near Mill Race Road between Quakertown (Exit 44) and Lehigh Valley (Exit 56). The crash involved a state trooper vehicle, tractor-trailer and a third vehicle. Video from a viewer shows the tractor-trailer after it burst into flames along the roadway. There has been no word if there are any injuries or how long the road will be closed.