The Honor Roller is Martin Prince's soapbox derby car. It's designed by NASA engineers and resembles the US space shuttle in it's appearance. The soapbox racer car goes very fast that Martin is unable to stop and crashes, resulting in his
inability to, and fear of, competing in further races. In turn, Bart volunteers to drive it for him, in which Martin agrees.
Episode 9 of Season 3: Saturdays of Thunder
The Honor Roller is owned by Bart in the game, and it also has a motor. It first appears in Level 2 as Bart's default vehicle, but one can play it in all levels.
The player(s) can use the Honor Roller to pick up passengers.