Last spring, after Dallas officials raised concerns with scooter-rental firms that riding scooters at night could be dangerous, officials thought they had won a promise from Lime that it would remove scooters from the streets every evening. Now, officials say Lime, one of the two scooter companies operating in the city at the time, hasn’t followed through.

Lime scooters remain available on Dallas streets after dark, even after a Dallas man died in a late-night crash on a Lime scooter five months ago, according to Jared White, a transportation planner for the City of Dallas. And that is highlighting a new source of tension between some scooter-rental firms and city authorities: whether scooter rentals should be allowed to operate at night. Some firms aren’t taking chances. Lime’s archrival, Bird, says it turns off the scooters during the overnight hours out of safety concerns.