Nano Car: World's Smallest Car
But, even for the car of this size it has a chasis, freely rotating axles and a pivoting suspension. The wheels are buckyballs, spheres of pure carbon containing 60 atoms a piece. Though it's unlikely you can fit into this car or take a ride, this technology is being built for making nano trucks that can carry payloads.
So maybe the next time around, viruses or bacterias can travel in their nano trucks and cars ;)