People ride a Uber Technologies Inc. Jump Bike pedal electric bicycle, right, and a Bird Rides Inc. shared electric scooter in San Francisco, California, U.S., on Friday, April 13, 2018. GPS-enabled�scooters�and bicycles are spreading across several major U.S. cities, driven by a wave of venture capital into a handful of companies.�Policymakers are scrambling to find ways to regulate the�great scooter boom of 2018. Photographer: David Paul Morris/Bloomberg