[soo-per-hahy-wey, soo-per-hahy-wey]
a highway designed for travel at high speeds, having more than one lane for each direction of traffic, a safety strip dividing the two directions, and cloverleaves to route the traffic on and off the highway. Compare expressway.
any very fast route or course.

1925–30; super- + highway Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
superhighway (ˈsuːpəˌhaɪweɪ)
chiefly (US) a fast dual-carriageway road

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1925, from super- + highway.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

superhighway definition

information superhighway

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Encyclopedia Britannica


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
Down a bit on the information superhighway, the road ends.
Most companies are better at giving employees access to the information
  superhighway than at teaching them how to drive.
The result is that congestion on the information superhighway at rush hours
  rivals congestion on conventional highways.
Picture the system as a spinning superhighway, divided into myriad narrow lanes.
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