The difference between Highway and Motorway
When used as nouns, highway means a main, direct public road, especially a multi-lane, high speed thoroughfare connecting major population centers, whereas motorway means a broad highway designed for high speed traffic, having restrictions on the vehicle types permitted and merging lanes instead of cross traffic.
check bellow for the other definitions of Highway and Motorway
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Highway as a noun:
A main, direct public road, especially a multi-lane, high speed thoroughfare connecting major population centers.
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Highway as a noun (rail):
Any public road for vehicular traffic.
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Motorway as a noun (British, Ireland, New Zealand, parts of Australia):
A broad highway designed for high speed traffic, having restrictions on the vehicle types permitted and merging lanes instead of cross traffic; in parts of the United States and other places called freeway.