Matthew DeBord/BI
Except that there are now plenty of vehicles available that have three wheels.
There's the Can-Am Spyder, the Campagna Motors T-REX, and the Polaris Slingshot, to name a few. There's also the Elio, which recently paid a visit to out New York office.
Soon to join the party is the all-electric Arcimoto SRK (those aforementioned rides all run on gas), effectively a $12,000 tandem three-wheeler motorcycle that can be outfitted with a fully enclosed "cabin" or converted to delivery van duty.
It might be the ultimate city vehicle. And we checked it out: