If you all ready have a roads system and need to update it to use the new curves, just decide on the curve you would like.Then select the main
RoadNetwork_Main_pf (the root object of the road system),and change the all the materials sets to use the curve materials (All names as CurveA, CurveB, CurveC and Extended),Then update the UV set drop down list to match for choice of curve. Then just create the road mesh again.Select RoadNetwork_*_pf
Change all the materials to use the curve sets
Change the UV set to use the new curve code