“Who makes buses rev and go / through detours, gridlock, storms, and snow? / Block by block, who smooths the journey­—/ potholed, hilly, testy, turn-y?” This engaging, simplified look at behind-the-scenes workers who make sure various types of vehicles and transport run smoothly pairs a fact-filled rhyming text with bright, bustling illustrations. Buses, cargo trucks, subway trains, commuter trains, boats and ferries, and airplanes are featured. Each type of vehicle gets an introductory page spread, followed by a page spread showing workers such as mechanics, fork lifter operators and loaders, track maintenance workers, ticket agents, and dispatchers getting their moment to shine. The illustrations show diverse people working across the many types of jobs and are filled with details that will be a delight for young children to pore over.