Kind of a poor man's Soarin' Over California "surround" film featuring scenes from Tron, as you went through the Carousal building on the Peoplemover.
It started out as just "Superspeed Tunnel" which was scenes of POVs from boats and racecars with wind thrown in your face, and then when Tron came out, they added those Tron scenes to Superspeed Tunnel and changed the name to something like "Peoplemover, featuring Tron Superspeed Tunnel."
Many of those that worked at the park at that time called it "Ron Superspeed Tunnel" or "The Ron Tunnel" after then Disney chief honcho and producer of Tron (and Walt's son-in-law), Ron Miller.
Some stuff from the internet:
And here's SuperSpeed's Attraction Poster:SuperSpeed Tunnel added 1977, Tron feature added 1982 to August 21, 1995
Though the attraction name when Tron was added seems to have been both, "Peoplemover Thru The World of Tron"....
...and Tron Superspeed Tunnel:
In 1977, the SuperSpeed Tunnel was added to the PeopleMover. It was located in the Carousel Building, then housing America Sings . Race cars were projected on the walls all around the trains. In 1982, the scenes were changed to clips from Tron's light cycle race scene, and the tunnel was renamed Tron SuperSpeed Tunnel.