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On Thursdays, Charles Dandino becomes the conductor of an unusual kind of train. He leads what he calls a “ bike train, ” a group of cycling co-workers who band together for their 6-mile ride to work in the name of safety, as well as for fun and exercise.

After rising for several years, the percentage of commuters (通勤者) turning to bikes declined for the third year straight. In some cities, the decline was far more serious. In Tampa, Florida, and Cleveland, cycling to work dropped by at least 50 percent.

Experts offered several explanations for the nationwide decrease. Most obviously, lower gas prices and a stronger economy contributed to strong auto sales and less interest in cheaper alternatives, such as mass transit and bikes. The rise of ride-hailing services (叫车服务) such as Uber and electric scooters cut into bike commuting.

Around the country, city transportation officials wish there were more bicyclists like Dondino as they seek to cut traffic jams, promote health and identify alternatives to cars. Federal highway spending on bike and pedestrian-related improvements totaled $915.8 million this year. City officials tried to support bike commuters. Besides new bike lanes and trails, many cities added bike sharing programs, which allow cyclists to rent a bike to ride point-to-point or for the day.

For bike commuters, safety is a top consideration. It was one of the reasons that Dandino created his bicycle train. “ Riding bikes in a group is more thrilling and a joy to do, ” said Dandino. “ On the safety side, it makes us much more visible, and there’s strength in numbers. ”

Barbara Insua also rides regularly with Dandino’s bike train. She said she loved getting a workout on the way to her job. “ Uphill to work. Downhill home, ” she said. “ There are so many wonderful things about biking. ”