A dog trotting through the busy Ted Williams Tunnel in Boston narrowly missed being hit by traffic before Massachusetts State Police rescued the wrong-way rover.

Surveillance video from the Massachusetts Department of Transportation shows the black-and-white pup heading toward oncoming traffic on the East Boston side of the tunnel during the morning commute on Thursday. A blurry figure of a person is seen running after the animal as it moves from the right, through the middle lane, and finally comes to a halt near the far left wall. It is unknown whether that person was the dog's owner or a good Samaritan.

A later video shows a state police vehicle parked on the road inside the tunnel. Other cars can then be seen coming to a stop in a staggered formation.

The trooper left his car with t

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