5: Ariel Atom
Open-wheeled sports cars have been increasing in popularity over the last year. The Ariel Atom is a relatively recent open-wheeled sports car designed to look like a futuristic cruiser. Ariel Motor Company built the car, and it was designed to be a featherweight driving experience. The old adage that the lighter weight a vehicle is, the faster it drives is true here (via Top Speed).

Leno likes to go fast but he also likes an interesting driving experience, which is why the Ariel Atom is a favorite vehicle in his collection. He enjoys driving it and has shown it off on an episode or two of Jay Leno’s garage. There are few open wheeled roadsters on the market that are as unique as the Ariel Atom.