No emissions - humans only need a toilet here and there
Fast & Efficient - only a vehicle that accelerates like a "normal" car will not be overtaken and hinder car traffic, which is in my view the highest safety danger when riding a bike through town. So electric assist is a requirement.
CO2 Neutral Production - using biological Construction Materials not only saves, but stores CO2.
(one day) Open Source - only a free design can serve as a planetary solution, getting a reward through CrowdFunding is the GOAL and then move to decentralized global production.