With electric scooters and short-term bicycle rentals continuing to flood the Westside, Los Angeles city officials have begun to discuss how to regulate the transportation companies to minimize cluttered sidewalks and ensure rider safety.

The Transportation Department proposed a one-year test program Wednesday that would limit each company — including the start-ups Bird, LimeBike and Jump Bikes — to no more than 2,500 vehicles within city limits, and would impose strict rules for parking and data sharing.