Changed my mind about this app
Not all the doors open. Also, swiping diagonally along the road does not advance the vehicles. You must swipe horizontally - which is counter-intuitive. App is boring after 3 minutes.
*UPDATE*
My original review was for three stars, but that was before I introduced this app to my son, now 18 months old. Whereas I was bored after a few minutes, he has been fascinated by it for weeks now. He is currently going through a "car phase" and City Vehicles has become his go-to app. It makes sense, as this is like a way to play with virtual, miniature die cast cars. I still think there is room for improvement - hence the 4 stars.
Seeker007 about
Kids Vehicles: City Trucks & Buses for the iPhone