I saw something on the highway today that looked like this or the Nissan Hypermini.  It was headed the other way, so I didn't get a chance to check it out, but it looked to be traveling at a suitable speed. Didn't even get a chance to count the number of wheels. Could have been ZAP.
 But, small?  Don't even think about surviving an accident. Up here, you wouldn't even want to use it at night, cuz hitting a deer would kill ya.


http://alan.batie.org/ev.html

Rat

I like three-wheelers. One of my neighbors has a Corbin with noisy bearings. Safer than a motorcycle. They're classified by the NHTSA as a motorcycle, so they aren't subject to the American byzantine automobile safety laws.

The rear wheel can be the drive wheel and powered by chain, like a motorcycle. I've daydreamed about taking a VW beetle front end, a Harley rear-end, an electric motor and a 12hp Yanmmar diesel to drive the charging system for a plug-in hybrid.

Ever seen a three-wheel Morgan from the 1930s?