A more thorough explanation:

Definition: Highway law is concerned with the regulation and maintenance of all means of travel open to the public, such as turnpikes, toll roads, bridges, ferries, navigable waters, etc. Highways are distinguished from private roads in that highways are intended for public use and are maintained at the public's expense.

For example, a state government may establish a highway system that includes major interstates, state routes, and local roads. These highways are open to the public and are maintained by the government using taxpayer funds. Private roads, on the other hand, are owned and maintained by individuals or organizations and are not open to the public.

The U.S. Department of Transportation (DOT) is responsible for establishing overall transportation policy for the United States. This includes programs such as the Federal Highway Administration, which oversees the construction and maintenance of federal highways, and the National Highway Traffic Safety Administration, which sets safety standards for motor vehicles.

Overall, highways and motor vehicles law is important for ensuring safe and efficient transportation for the public.