Tunnel | Enclosed underground End egress opening Low ride |
U
rbanization in rough terrain has transportation consequences. This image was captured just a few feet into the Armstrong Tunnel in Pittsburgh. This structure was built in 1927 and runs under Boyd's Hill, actually a portion of the Monongahela River bluff. I would have gone deeper into the bore, but strident noise generated from rushing traffic was obnoxious.
“The light at the end of the tunnel is not an illusion. The tunnel is.” - unknown
