American Heritage Dictionary
(2)
Century Dictionary
GNU Webster's 1913
WordNet
(2)
Elsewhere on the web
The crushed concrete road might not be a superhighway, but Kandis - who is learning to drive - will take her chances.— The Facts: News
And what's the big deal about NAFTA its a superhighway, I mean NO traffic come on how great is that.— Alex Jones' Prison Planet.com
There were fears that parts of Bill 1507, which dealt with Foreign Trade Zones, were tied to the superhighway which is to extend from Mexico to Canada.— Vive Le Canada - All Stories - Vive Le Canada
Add two gay men, one perhaps underage, and you've got a train carrying nuclear waste derailing and heading for a superhighway at rush hour.— Gayired.com - Gay OnLine Community for Entertainment and Daily News

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