At this point in time, S just loved to colour the background black to represent night time. I told him that he could use grey colours or blue mixed with brown, but he just wanted to use black. He also used black for the road.
I made a little book for the boys from A4 sized papers, folded into 4 and folded in a special way to make a book. S decided to give each vehicle a name and asked me to write down their names.