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Mr. White said too many roads lacked safety improvements like protected bike lanes, pedestrian safety islands and greater visibility at crosswalks.

“Even before the safety islands, babies were abandoned,” Mr. Zhang said.

The design, which features separated bike paths, dedicated left-turn lanes and pedestrian safety islands, was installed in earlier phases of the Eighth and Ninth Avenue bike lane projects, and Ms. Garcia said safety statistics had shown “promising results.”

Once an automobile came near hitting him, but he jumped upon one of the small safety islands.

He decreed barber-striped safety islands and chevron-striped crossing lanes.