It carried traffic in both directions until the opening of the parallel Callahan Tunnel in 1961.

The Callahan Tunnel is named after his son who was killed in action during the Second World War.

But the drive up the Central Artery and through the Callahan Tunnel can take more than half an hour.

But the toll-booth attendant at the Callahan Tunnel seemed puzzled.

They had just entered the Callahan Tunnel, which burrowed beneath the Charles River.

We were still half a mile from the Callahan Tunnel, gridlocked in a line that was barely moving.

If we hadn't turned around at the Callahan Tunnel we would have missed it.

Take so-called light piping, which is used in the Callahan Tunnel under Boston Harbor.

From the Callahan Tunnel in downtown Boston, follow the signs to Route 1A north.

Marblehead is north, through the Callahan Tunnel and along Route 1A.