Heres a SA article with some info: https://www.stamfordadvocate.com/news/article/Stamford-banned-motorized-scooters-in-2005-Now-17258043.php

There is probably some more detail in city ordinance you can look up. It doesn't seem like this is strictly enforced but having the ban on the books eliminates a scooter share system from being implemented in the city. Having recently been to a city that has a similar density to Stamford I found them to be extremely convenient way to get around, albeit a bit expensive.