1.New roads are built because the old road sometime get owercrowered and new houses are built.

2.Engineers make the road.

3.Roads are zigzag because it is safer and not so steep.

4. Bulldozers clear the land motor scrapers take  away dirt from where it is not needed.

5.Heavy rollers pack down the dirt.

6.Graders are like motor scrapers and get rid of the dirt.

7.Hard wearing means stronger and tough.

8.Roads are higher in the middle so rain runs off the road.