Robert Q. Riley Enterprises is set to introduce their new XR3 hybrid 3-wheeler in June {Autoblog Green}

May 22nd 2007 1:48PM Indeed, the three wheel 'tadpole' design (2-in-front) provides superior stability. The advantage of the motorcycle designation is, as Jeremy mentions, is the cost of production and product testing. The manditory crash tests for cars is an excellent barrier to entry for the lazy 'big 3' automakers, preventing competition in the fuel-efficient vehicle market.

Riley and others, however, are real innovators. What we need now is to show 'proof of concept' to the market and expand the American public's mental model of what personal mobility is about. These vehicles are very, very cool, and an excellent substitute for the oversized American car.