A broad highway, often with six or more lanes, used for high-speed traffic. (noun)
See expressway. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "superhighway" in a sentence
"The information superhighway is a busy thoroughfare and there's going to be some road kill along the way."
"Sure, the information superhighway is supposed to meld all these technologies into a torrential digital stream."
"GRACE: The so-called superhighway is just that, it's just a pit stop for predators to gather, to share their stories, share their illegal photos and pass on tips to each other, and they do, to how better meet, seduce, have sex with and sometimes kidnap our children."