Ten vehicles, from car and bus through to helicopter and rocket. Most of these are things your child can spot on an ordinary walk, so the deck gives you something to do afterwards — naming the bus that actually goes past is worth more than another run through the cards.
They move, they make noise, and they turn up everywhere. Children notice them without being asked to, so the words get rehearsed naturally.
Car, bus and train are usually known before aeroplane or helicopter, simply because they are seen more often.