Freeway" and "highway" are mostly interchangeable words used to describe a road devoted to higher-speed traffic between cities.
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This information comes from my own knowledge.
Freeway" tends to be used more on the West Coast of the U.S., "highway" is more of an East Coast term. In the U.K., most people will refer these this kind of road as a "motorway."
Generally, "freeway" isn't used to describe toll roads, although the term refers more to the motorist's ability to drive free of slower, local traffic rather than to drive without paying to use the road.
The term "highway" may also be used to refer to a road that is elevated from the "surface" streets.
Other terms that are more or less interchangeable with "freeway" and "highway":
Throughway, or thruway Expressway Superhighway Interstate (to designate a limited-access road that is part of the federal interstate highway system) Parkway (usually designates a scenic, limited-access road)
A "turnpike" also is a high-speed road, but the motorist must pay a toll. The word comes from the first toll roads, which were blocked at each end by a long pole (or pike), supported on a swivel point. When the toll was paid, the operator turned the pike around to permit passage.
Parts of the interstate system are toll roads, most famously, perhaps, the section of Interstate 95 that goes through New Jersey (the New Jersey Turnpike).
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