While the ear-splitting sound of a jackhammer at work or the rumble of a garbage truck early in the morning might t not be everyone's favorite noises--they come from important machines that keep the infrastructure of cities and towns running smoothly. This high-interest caption series highlights the amazing hard-working machines that help build and maintain our roads and cities. Each volume takes a look at the exciting activity of a construction site through the lens of a different machine. Emerging readers will eagerly build new vocabulary as they learn more about these machines and their roles in construction and overall city upkeep.