WASHINGTON – A young man talking on a cellphone meanders along the edge of a lonely train platform at night. Suddenly he stumbles, loses his balance and pitches over the side, landing head first on the tracks.

Fortunately there were no trains approaching the Philadelphia-area station at that moment, because it took the man several minutes to recover enough to climb out of danger. But the incident, captured last year by a security camera and provided to The Associated Press, underscores the risks of what government officials and safety experts say is a growing problem: distracted walking.

On city streets, in suburban parking lots and in shopping centers, there is usually someone strolling while talking on a phone, texting with his head down, listening to music, or playing a video game. The problem isn’t as widely discussed as distracted driving, but the danger is real.