Bibliography, etc. Note: Includes bibliographical references (pages 24) and index.
Formatted Contents Note: Why do we have machines on the road? -- What types of car can you see on the road? -- Which other machines carry people? -- Why are bicycles and motorcycles useful? -- What are the biggest machines on the road? -- Which machines help to clean the roads? -- Which road machines help to keep us safe? -- What does this road machine do?