First here are some earlier screen shots from my project.

You can see the roads and bridges over a terrain. I created a scripting system that places where curves start, how sharp they are.
I put this project away some time ago because I was busy working. Now that I am unemployed I did some work on it. Some of the scene elements are standing in for now. Tweaking the media and programming is an ongoing work in progress. I have to look at some of those fancy water animations techniques.
This game is based upon an old 8-bit game called Autodual, which had an MS-DOS version, Commodore 64 version, Atari 8-Bit (800XL) version. Think there were Amiga & Atari ST versions. The graphics were quit primitive by todays standards. Keep in mind it was before Amiga, VGA, and 3D acceleration. It was cross platform and game play was almost the same on the different systems. What I am doing is moving the basic Role Playing elements over into a modern 3D environment.
I tweaked the Roads on Terrain subroutine to test the ability to intersect roads to each other. It can also do curves on a bridge. I added edge of map tunnels that when you enter, the game will pause while you move to the next map. Decided to do it that way because doing the entire region with multiple large cities would be problematic.
If you are familiar with the original game, it has you going between buildings to build up your vehicle. You go to an assembly plant to build your car, go to an Arena and compete, a garage for maintenance, and an AADA where you can earn money by making deliveries to buildings in other cities. There were other places doing functions.
AutoWarriors is going to be a variant and include buildings doing different things. For example I am going to have gas stations, city halls, and used car lots. Doing some of these things to avoid copyright conflict from the original game since it will be costly to obtain the rights from a card game which is also serving the basis for this game.
I would like to bounce ideals off of other creative people on this forum and see if I can fine tune my game. Still looking for helpers, programming, modeling, etc. But that is strictly voluntary at this point. I can share some of the subroutines, pretty sure a few can make use of "roads on terrain" and "bridges"