I did know about it, not by name at present, but at one time I did so. I am what is called a roadgeek, so old alignments and abandoned stretches of road, especially with remaining signage, are very cool to me. An example of an abandoned roadway would be US Highway 101 through Camp Pendelton Marine Base in California. It was left behind when the military base expanded some time ago.
http://www.roadsites.org/losthwy/us-101_cp/old_divided_hwy.jpg
http://www.roadsites.org/losthwy/us-101_cp/old_sign_1_context.jpg
http://www.roadsites.org/losthwy/us-101_cp/old_sign_3.jpg

Makes you think of Logan's Run or Planet of the Apes, doesn't it?