Ok... it doesn't have to just be cars. Anything drivable. He is COMPLETELY obsessed. He pushed them all over the house and is entertained for hours. If we are being honest it doesn't even actually have to have wheels. He will pretend if needs be. I have seen him turn things like remote controls, phones and even my shin guards in to cars. Every once in a while Andrew will let him sit in the front seat of the car and "drive" he goes crazy with the steering wheel and he suddenly becomes the happiest kid in the world.