why hilly road are bend?
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There are several reasons why roads on hilly areas are curved instead of straight. Another reason is in the event that the road gets icy, it would be very difficult to traverse up and/or down a steep grade and have good traction. Vehicles would have a tendency to slide all over the place.
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Mountainous roads are winding and gently sloping in order to reduce the effect of steepness which causes more downward gravitational pull to the vehicles on it. A steeper sloped road would slow the car down to a greater extent that an gently sloping one. So, we have in effect reduced the undesirable effect of gravity by doing so.
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