"Freeway" and "highway" are mostly interchangeable words ud to describe a road devoted to higher-speed traffic between cities.
"Freeway" tends to be ud 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 the this kind of road as a "motorway."
Generally, "freeway" isn't ud 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 u the road.
The term "highway" may also be ud 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)
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- 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 ction of Interstate 95 that goes through New Jery (the New Jery Turnpike).