WordNet (r) 3.0 (2006):

superhighway
    n 1: a broad highway designed for high-speed traffic [syn:
         expressway, freeway, motorway, pike, state
         highway, superhighway, throughway, thruway]
    2: an extensive electronic network (such as the internet) used
       for the rapid transfer of sound and video and graphics in
       digital form [syn: superhighway, information
       superhighway]

Moby Thesaurus II by Grady Ward, 1.0:

74 Moby Thesaurus words for "superhighway":
   Autobahn, US highway, alley, alleyway, arterial, arterial highway,
   arterial street, artery, autoroute, autostrada, avenue,
   belt highway, blind alley, boulevard, bypass, byway, camino real,
   carriageway, causeway, causey, chaussee, circumferential, close,
   corduroy road, county road, court, crescent, cul-de-sac,
   dead-end street, dike, dirt road, drive, driveway, expressway,
   freeway, gravel road, highroad, highway, highways and byways,
   interstate highway, lane, local road, main drag, main road, mews,
   motorway, parkway, pave, paved road, pike, place, plank road,
   primary highway, private road, right-of-way, ring road, road,
   roadbed, roadway, route nationale, row, royal road, secondary road,
   speedway, state highway, street, terrace, thoroughfare,
   through street, thruway, toll road, township road, turnpike,
   wynd



The Free On-line Dictionary of Computing (30 December 2018):

information superhighway
information highway
superhighway

    (Or "Infobahn", "Info Strada") The name
   coined by US Vice-president Al Gore in the early 1990s for the
   emerging high-speed global communications network capable of
   carrying voice, data, video, and other services around the
   world.  These services use satellite, copper cable, optical
   fibre, mobile telecommunications, and are accessible via
   set-top boxes or suitably equipped computers.

   See also National Information Infrastructure.

   (2001-03-31)