one of the dozen 1966 General Motors TDH-5303 used in the hit 1994 movie Speed just sold at auction for $102k

By the time Speed was out in theaters, the buses used were 32 years old, which was perfect for the production at the time. The GM buses were cheap, noisy, durable, and easy to modify, making them ideal for a big budget Hollywood blockbuster.

 Though the premise was a bit shaky, Speed was a box office smash and even a hit with critics, leading to one of the dozen buses used in the movie to sell at auction for over $100 thousand.

Out of the dozen buses used for Speed,
two of them were blown up and one crashed into an airplane, while there were
 two that were used for interior shots, another set of
two for exterior shots, and finally another set of
two that were used for the action sequences.
An additional bus was used for the infamous freeway jump scene.

It is not clear which of these buses from the production that the one sold is from, but it is obviously not any of the three that were blown up. The item was listed as good condition with production wear, which means that it could've been used in the action sequences.

The previous owners acquired the bus from 20th Century Fox after filming wrapped in 1994 and have had it stored ever since.

https://movieweb.com/speed-movie-bus-auction-50mph/