Car speeds increased dramatically in the 1960s, pushing the limits of the "classic circuit" and sparking criticism of the track as being unsafe after several trials related fatalities occurred. In 1965, a smaller, but permanent, Bugatti Circuit was added which shares the pit lane facilities and the first corner (including the famous Dunlop bridge) with the full "Le Mans" circuit. For the 1968 race, the Ford chicane was added before the pits to slow down the cars. The circuit was fitted with Armco for the 1969 race. The "Maison Blanche" kink was particularly harrowing, claiming many cars over the years (including three Ferrari 512 variants) and several lives, including the legendary John Woolfe in 1969 behind the wheel of a 917 Porsche . The circuit has been modified ten more times — 1971, a year when prototypes were averaging over , was the last year the classic circuit was used. That year, Armco was added to the pit straight to separate the track from the pits. In 1972, the race track was considerably revamped, at a cost of 300 million francs, with modification of the pit area and the first and final straights, the addition of the quick Porsche curves bypassing "Maison Blanche", the signalling area was moved to the exit of the slow Mulsanne corner, and the track was resurfaced.