With e-bikes soaring in popularity, regulators have been unable to keep up with the quickly-evolving market. Safety and law enforcement officials note that many models marketed to children and teenagers exceed legal speed limits and more closely resemble motor vehicles, which require a license and registration to operate.

For the moment, the power to decide what teenagers may or may not ride falls to a nongovernmental authority: parents. Across the country, they are expressing a mix of enthusiasm, contrition and uncertainty about the trendy mode of transportation.

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