Engine, Rescue, & Chief 53 responded to this overturned SUV on Interstate 476 Southbound prior to the West Chester Pike off-ramp.  Engine 53 arrived to find a single SUV on its side with the engine compartment well involved.  Crews initiated fire attack on the vehicle, while EMS tended to two occupants who had escaped the wreckage.  Engine 53 remained o/s to assist PSP until the vehicle could be removed, traffic was detoured for approx. 1.5 hours.