I finally figured it out!!!

You can create a realistic road in 3ds max in 2 minutes using these steps.

1) Create a 2D curved track (complete loop) using 2D splines line tool. (Remember to create the spline smooth, smoother the curves on spline less poly you track will be).



2) now create a box (keep height of box nearly 0).

2.5) Texture the box(skip this step if you are doing this tutorial for first time) with proper u-v mapping.
Remember the u-v mapping values as you would need them in unity as well.Also Instead of rotating your u-v map in 3ds max
rotate the texture as unity does not have u-v rotation facility.



3) add pathDeform modifier(remember not PathDeform(WSM) to the box.

4) pick path in the pathDeform(WSM) modifier and select the 2d spline.

5) Select path deform axis to place it in appropriate direction.


6) Increase the width and width segments.

7) Now convert it into a editable mesh and there you go!!



Remove the polygons on back and on sides
> Select Ignore Backfacing in selection menu of editable mesh modifier.
> Now select the track using selection box and invert your selection to
select the sides and back of the road. now delete them.
8.5) Remove the spline.

9) Move the Vertex or Faces to shape it according to your requirement.


10) Import the .max file in unity to create your road!!


Congrates you have made a perfect low poly realistic curvy road in just 500 polygons