On July 1, 1975, at 10:35 a.m., e.d.t., a Winnebago motor home traveling south on Interstate 75 ran off the highway and crashed near Monroe, Michigan. The motor home left the roadway, struck the end section of a guardrail, then struck a concrete bridge column, and caught fire almost immediately. The fire which destroyed the vehicle was fed by two 40-pound propane tanks which became detached from the vehicle. Of the 10 vehicle occupants, the driver and a passenger, neither of whom was wearing a seatbelt, were injured when they were ejected through the front of the vehicle. Seven persons perished in the subsequent fire and one was injured but escaped from the vehicle unassisted.