Hello everyone,
I would like to create a digital asset in houdini for generating procedural roads.Could any one please tell me whether I could find any existing plug ins for the same in any other software. If any one has already done a digital asset on the same, could you please give some kind of resources in order to generate the roads procedurally.

Look at www.cmivfx.com

They have a whole training series for procedural road creation in houdini

There's the recently released road builder series of 3 lessons to check out here:

http://cmivfx.com/productpages/product.aspx?name=HOUDINI_ROAD_GENERATION_I [cmivfx.com]