High Quality Content by WIKIPEDIA articles! Butterfly doors or vertical doors are a type of door often seen on high-performance automobiles. They are similar to scissor doors, but while scissor doors move up, butterfly doors also move outwards, which makes for easier entry/exit at the expense of saving space. The McLaren F1, Alfa Romeo 33 Stradale, Saleen S7, Enzo Ferrari, Toyota Sera - EXY-10, and the Mercedes-Benz SLR McLaren, among others, use butterfly doors. It was also a common feature for Group C and IMSA GTP/Camel Lights prototype racers as they incorporate teardrop top which allows the driver to get in and out of the car more quickly than conventional and gullwing doors, especially in a cramped pitlane environment such as the pre-1991 Le Mans circuit.

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