Hairpin turn

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The type of hair pin (bobby pin) from which a 'hairpin turn' takes its name.

A hairpin turn (also hairpin bend, hairpin corner, or just hairpin), is a very tight corner. It makes a vehicle turn almost 180° to continue on the road. It gets its name from the way it looks like a hairpin or bobby pin. Hairpin turns may be called switchbacks in American English.

Hairpin turns may be built when a road or path climbs up or down a steep slope. This allows the path to travel the slope with a smaller slope. Hairpin turns may be used in race tracks to slow down the race cars after a long, fast straight.

Hairpin turns
Road ascends to the Col de Braus using hairpin bends in the French Alps  
Hairpin turn on the Mont Ventoux in France  
Grand Hotel Hairpin in Circuit de Monaco