How can I simulate a real road network?

Hi,
I have the data for roads, their location(magnetic and geodetical), height and properties like whether it's one way or only for heavy vehicles and such. Now, how do I use this data to create a real time road network? Has someone done it earlier? Is it too ambitious for a Blitz3D application?
Need help.

Also, I am storing all road data in a database. I haven't found here anybody who is using database in a project. It will be great if I get some references to that as well...

For drawing roads(road meshes preferably) in real time, I am fetching the related data from the database...

I look forward to your comments and questions.