At 0312 hours, Companies 10, 11 & 560 were dispatched to the area of Rt 12 EB @ Rt 61 for a MVA involving the PennDot Crash Truck. PennDot crews were doing some late night work on Rt 12. As always they are protected by their crash truck. An SUV came up and rear ended the truck. The occupanys in the SUV fled and the driver of the PennDot truck was transported to a local hospital for an evaluation. Crews assisted with debris cleanup as well as providing some scene lighting. We were clear from the scene @ 0401 hours.