What's the meaning of 'tight hairpin bends'?
The narrow road to the top of Nandi Hills winds up in a series of over thirty tight hairpin bends to a point over 1500 meters above sea-level.

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A hairpin is used by women to hold things in there hair. 
It is usually made of metal and has the shape of a "U" with long sides.
So the expression describes a turn where the vehicle coming out of the turn is going in nearly the opposite direction than it was in coming into the turn.

Hope that helps.

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thank you:-)

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http://thumbs.dreamstime.com/thumblarge_157/11822680406X31eG.jpg

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A very sharp turn/bend in the road.  Requires slow speed and caution.  Usually found in mountainous regions.