Car Wash by Sandra Steen - Using a mixed media style of illustration and create fonts this imaginative story is envisioned by a pair of kids going through the car wash in the backseat of their father's car.
Little Blue Truck Leads the Way by Alice Schertle- A little blue truck ventures into the big city and get shoved about by all the other bigger forms of transportation.
Dinos on the Go by Karma Wilson- Follows the same recipe as her book "Dinos in the Snow." What kid doesn't like dinosaurs and trucks. Put them together and you get an instant hit! Though I often find her books can lose kids by the end due to the sheer amount of repetition.
Clickety Clack by Rob and Amy Spence - A fun train ride of a book. Great call and response participation with the familiar line "clikety clack" which kids can accompany with clapping out the syllables.
If I Built a Car by Chris Van Dusen- Nice rhyming scheme and lush, colorful illustrations from the creator of Mercy Watson. On the long side so do wiht older pre-schoolers or do as your first book at storytime.
I am a Backhoe by Anna Grossnickle Hines- Fun book to have the kids mimic the movements of each piece of heavy machinery like the boy in the story does.
Vroomaloom Zoom by John Coy - A little girl and her father go for a drive and pass through all sorts of crazy terrain.
Tip Tip Dig Dig by Emma Garcia - With great large Eric Carle style illustrations this is a fun audience participation book. Get the kids to act out the motions of each type of machine. Ie: lift, dig, push to create a beautiful playground at the end of the book