The granite-wheeled steamless steamroller pushed around by Fred Conan-quads Flintstone is number three on TIME magazine’s list of the best fictional vehicles of all time. It’s recognizable enough that it was featured on the 1994 live-action movie poster, and the iconic image of the car tipping after receiving a rack of brontosaurus (read apatosaurus) ribs is all-too familiar. There are many benefits that could be used in modern society by a human-powered vehicle, so we must turn to the beginning of the modern stone age: could someone actually…