The United States Numbered Highways (also known as U.S. Highways) is a national system of roads in the United States. These roads connect to places across the country. Some of the roads are freeways, which means cars must use ramps in order to get on or off the road, but others are surface roads. Many U.S. Highways, such as U.S. Route 66, have had their numbers removed because of the creation of the Interstate Highway System.[1]