Mostly straight yet winding?? :)
Depends what software you're using. In Max4, create a line which has the shape of your road, then create a further line which is the cross-section of the road. Select the first line, and select "Compound Objects" in the "Create" panel, and choose "Loft". Click on "Get Shape" and click on the cross-section.
After that, fiddle with the settings in Skin/Surface parameters to get it to look right.
Depends what software you're using. In Max4, create a line which has the shape of your road, then create a further line which is the cross-section of the road. Select the first line, and select "Compound Objects" in the "Create" panel, and choose "Loft". Click on "Get Shape" and click on the cross-section.
After that, fiddle with the settings in Skin/Surface parameters to get it to look right.