It'd be quite neat to select a vehicle and manually drive it around in first person to 'get a feel' for your world a bit better.
maybe you could pan your camera around, click on buildings and manually load/unload from them?
Trains would be fun like this too.
Would definitely add a heap of immersion into long games - especially when you're sort of stagnating, waiting for projects to be completed.
would also help take more control over things from time to time, instead of just directing vehicles to certain coordinates.
