The longest tunnel in the world doesn’t carry the kind of traffic you might think it does.
It’s not an automobile tunnel, as the world’s longest road tunnel, in Austria, is less than nine miles long. A railroad tunnel? No, the world’s longest railroad tunnel is only about 14 miles long.
The longest tunnel in the world really carries water! This tunnel, which is only 13.5 feet wide, brings water from a reservoir in the Catskill Mountains to New York City, a distance of about 105 miles!
A tunnel now being built in Japan, to carry both a road and a rail line, will be 33.5 miles long!