Here's an illustration of all of the vehicle play sets connected together to form a city. As mentioned the sets have triggers in them which play sounds as vehicles are pushed across their surfaces. We went for a 'micro machines' scale but with more realistic vehicle proportions.
Concepts for a race car and a hot rod. Each vehicle has it's own themed play set to go with it.
Fairly self explanatory.. ni nar ni nar (for the Brits over the age of 25) ;)
We had all manner of vehicles from emergency services to your friendly trow truck..
There always has to be a bad guy - bank managers beware!