We started with M choosing the colors he wanted to use. We're working on color names so it makes for good practice. He chose five colors today and I put them on the paper in globs. M dove right in. In fact, the activity was really half truck and half finger painting for us.
After I showed him how to use the trucks to make tracks he got into it. I put out two trucks that I knew would be easily cleaned off. A lot of our other trucks were too big or were matchbox type so I thought they'd be more difficult to clean off. These worked great but only gave us one type of tracks...
Our final project was a mix of finger paint smears and tire tracks.
I imagine it would be a fun thing to do with plastic animals if you could find some with distinctive footprints. M liked it but it ended up being kind of a quick activity. I think if we had had more vehicles or animals or toys to make different tracks it would have lasted longer. We did end up doing two sheets and then had fun giving the trucks a bath :)