Do some 3D Modelling

Hello, I am looking to have the great highways main roads, and some side roads and cities of japan modeled, in the tokyo area for a racing game. Buildings will not need super high detail, and it does not have to be 100% accurate. Main focus is nice smooth highways and roads to race or cruise around on with decent scenery. I have attached 2 pictures in google earth with the roads of interest highlighted in green. I would also like some of the areas around/below those roads such as parking areas and docks to be included. I also have pics of my failed attempt at doing something like this upon request. I saw that some programs such as cityengine bob track builder, arcgis and uc-win/road may be capable of utilizing google earth or google maps to make the job much less of a hassle. I will be using 3ds max 5 to put the model in game. Suggestions are welcome.