To elaborate on this, Nashville seized all Bird scooters until regulations could be put in place [1]. This is after two women were seriously injured downtown while riding the scooters [2]. I haven't used a Bird scooter yet although they seem like a good idea, however I have had close encounters while driving with people using them without helmets because of poor visibility and cramped roads here in town.

1: https://www.tennessean.com/story/news/2018/06/07/bird-scoote... 2: https://www.tennessean.com/story/news/2018/05/14/women-elect...