DEMAND FOR FOOD DELIVERY HAS SKYROCKETED. SO HAVE COMPLAINTS ABOUT SOME DRIVERS

A soaring demand for food delivered fast has spawned small armies of couriers - and increasing alarm - in big cities where scooters, motorcycles and mopeds zip in and out of traffic and hop onto pedestrian-filled sidewalks as their drivers race to drop off salads and sandwiches.

Officials in Boston, New York and Washington, D.C., have started cracking down on delivery companies by issuing warning letters, seizing illegally registered or driven vehicles, and launching special street patrols to enforce speed limits. The pushback is not limited to the U.S.:

There have also been a series of crackdowns in London and other British cities.

For their part, the delivery companies have pledged to work with city officials to ensure that all of their drivers operate both legally and safely.

In a letter this week to food delivery companies DoorDash, Grubhub and Uber, Boston officials cited an "alarming increase in unlawful and dangerous operation of motorcycles, mopeds and motorized scooters” that they said put the drivers, other motorists and pedestrians "in imminent danger."

The letter alleged that some drivers were operating unregistered vehicles and breaking traffic laws, and warned of an imminent crackdown on the vehicles. It also demanded that the companies explain how they can ensure their drivers are operating safely. The Massachusetts State Police said they identified dozens of mopeds and scooters that were improperly registered or being operated by unlicensed drivers. Fourteen illegal mopeds and scooters were seized in one Boston neighborhood alone.

In New York City, authorities have seized 13,000 scooters and mopeds so far this year; last week, they crushed more than 200 illegal mopeds and other delivery vehicles. Authorities in Washington, D.C., meanwhile, launched a program called Operation Ride Right to ensure drivers of two-wheeled vehicles are complying with the law. Since it began, authorities have made five arrests and impounded 17 mopeds.