Speaking as a highway engineer, 'standard' templates can be usefull but rarely suit the junction or whatever it may be that your designing. If you can afford the investment, and have the need, try buying some vehicle tracking software. Three spring to mind... AutoTURN (Obviously runs inside of the full product)... AutoTRACK (ditto the full product... or the scaled down version of AutoTRACK, WinTRACK. The company that make the 'track' versions are called Savoy, www.savoy.co.uk should fill you in with the necessary.