This is a wonderful series, with the most exquisite detailed illustrations that have an appeal way beyond small children. Certainly boys from the age of 2 should have at least one if they can't get the whole lot. The illustrations capture the children's attention and my boys can both spend literally hours peering at the tiniest details, spotting something new every reading which is remarkable considering the hundreds of times the book is read. I recommend all the series but I think this is the very best and the boys favorite because there is a wonderful double page picture of a quarry loaded with diggers and dumper-trucks, as well as a log-loader, ships and cranes, a background airport and the usual lorries, traffic jams etc. Watch out for the teeny-tiny sheep with the traffic cone on his head.