Turbo Truck has always stayed in his lane. That lane being the fast one. But when the only job left is one that calls for a delicate hand at the wheel, Turbo has the chance to prove to everyone--and himself--that he can travel at more than one speed.
As Turbo slows down, he discovers the satisfaction of a job well done (even one with no impressive accelerations) and the sights only visible from the slow lane.