It hauls heavy cargo. It travels long distances. This big rig is on the move! What kind of cargo do big rigs carry? And how do big rig drivers talk to one another? Read this book to find out! Learn all about mighty machines in the Vroom-Vroom series-part of the Lightning Bolt Books collection. With high-energy designs, exciting photos, and fun text, Lightning Bolt Books bring nonfiction topics to life!