Duck boats, the popular sightseeing vehicles in cities around the country, have lost some of their appeal because of a string of recent accidents.

In Boston, new safety regulations will go into effect in April after a duck boat ran over and killed a 28-year-old woman on a motor scooter last spring.

In Philadelphia, a duck boat operator suspended its tours indefinitely after three people were killed in two separate crashes.

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In Seattle, 10 duck boats were taken out of service after five college students were killed in 2015 when a duck boat collided with a bus.

The new Massachusetts law requires duck boat operators to install blind spot cameras and proximity sensors, and to have a second employee on the boat to narrate tours.