Hop in for a droll read-aloud vrooming with sound words and intricate illustrations of all things that go. What’s this? A huge traffic jam? But everyone’s in a hurry! There’s the family in the paneled station wagon, packed to the roof rack with gear for the beach. There’s the be-hatted Duke and Duchess, out for a drive in their ornate Rolls Royce. Not to mention a yellow school bus bursting with kids in beanies, an overheating race car, an ice-cream truck, and other vehicles revving to go. Who — or what — could be holding them all up?