Yes very perceptive of you. I think in the past you could catogorize smaller street-able vehicles as:

Covered GoCart
Cabin Scooter
Golf Cart (urban tranport)
Commuter Class
Sub-Compact

This one cuts accross those concepts by making a "Commuter Class/Cabin scooter" which is Freeway Ready. Although 15+HP require in most states is a little more than it actually needs.