In its early years, the Sebring circuit combined former airport runways with narrow two-lane service roads. The 1966 event was a turning point in Sebring history, as the facilities and the safety of the circuit were heavily criticized. Five people were killed during the race, which was more people killed than in the race's prior 15-year history combined. Bob McLean crashed while approaching the hairpin; his car rolled several times, struck a utility pole and then exploded, landing in a ditch and killing McLean. In another incident Mario Andretti in his Ferrari 365 P2 tangled with Don Wester's Porsche 906 on the Warehouse Straight near the Webster Turns, killing four spectators and then crashing into a warehouse next to the track. Subsequent to these events, the facilities were upgraded and the circuit layout was changed, including eliminating the Webster Turns and creating the Green Park Chicane further down the track to move the straight further away from the airport warehouses. The circuit was made safer, and since then there have only been 4 fatalities since then- a remarkable record for a circuit of Sebring's age.