Design roads for Car racing game

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I'm a new game developer, and working as mobile game
developer. I'm trying to develop a car racing game, but
not getting the road movement right!!
I tried many ways, but not getting right.
Can anybody please help me to sort out the problem.
I tried drawing polygon methods, cutting the road into
strips, but in vain. I just cant get the straight and
curves of the road look good.
Looking forward for some useful tips
BYE