motorway

[moh-ter-wey]
noun British.
an expressway.

Origin:
1900–05; motor + way1

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World English Dictionary
motorway (ˈməʊtəˌweɪ)
 
n
(Brit) superhighway, US names: expressway a main road for fast-moving traffic, having limited access, separate carriageways for vehicles travelling in opposite directions, and usually a total of four or six lanes

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
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motorway

major arterial divided highway that features two or more traffic lanes in each direction, with opposing traffic separated by a median strip; elimination of grade crossings; controlled entries and exits; and advanced designs eliminating steep grades, sharp curves, and other hazards and inconveniences to driving. Frequently expressways have been constructed over completely new routes, passing near but not through large centres of population, on more or less direct lines between desired termini. Their advantages include high speed, greater safety, comfort and convenience for drivers and passengers, and lower vehicle operating costs. Many of these new express highways, especially in the United States, are toll roads, but that is an incidental, not an essential, feature.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
At an ant's size, small twigs and leaves can be the equivalent of a bumpy,
  unpaved motorway.
Some motorway verges have strange eco-systems due to the salt levels.
The time has come to realize the original project and build a motorway.
Curious to know what extra measures have been taking place which improved
  motorway safety.
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