“Porst SP Old Plank Road 2,” by J Jakobson https://www.flickr.com/photos/30811353@N04/

"The Old Plank Road is a plank road in Imperial County, California that was built in 1915 as an east–west route over the Algodones Dunes. It effectively connected the extreme lower section of Southern California to Arizona and provided the last link in a commercial route between San Diego and Yuma. Following Los Angeles' winning the right to be the western terminus of the transcontinental railroad, San Diego's civic leaders proposed the Plank Road to ensure their city became the hub of Southern California's road network rather than Los Angeles." -Wikipedia "Porst SP Old Plank Road 2," by Flickr user J Jakobson https://www.flickr.com/photos/30811353@N04/