Using rider surveys and leveraging data-sharing requirements of the scooter companies, cities across the country began painting a picture of how well scooters might do in the United States.

Portland, Oregon’s Bureau of Transportation recently completed one of the most comprehensive studies to date of e-scooters’ impact on a city. It came about a year after e-scooters’ 2017 debut, around the time e-scooters were operating in 65 U.S. cities, 43 of which they entered without asking for permission.