A road is a wide, usually paved path that's big enough for cars to travel on. There are some roads that are so long, you can follow them from one coast of the U.S. to the other.
While some roads can be traveled by pedestrians, the word usually specifies a thoroughfare for vehicles, especially cars, trucks, and buses. The longest road in the United States is U.S. Route 20, which stretches from Oregon to Massachusetts. Figuratively, a road can also be a means to an end, or the way to achieve a certain result: "She's on the road to success!" or "He wasn't feeling well yesterday, but now he's on the road to recovery."