It is difficult to put the roads down in an orderly fashion in this game. This problem has been worked out for CAD programs (e.g. autocad).
A simplified version could include:
Top-view Select geometric figures for road network: choose road size, choose square vs pentagon, hexagon, circle etc. then drag and drop. Offset path for parallel highways (!) Simplify function for removing sharp curves
I think these would be hugely helpful.