Jewel of a Historical Ride: The Old Ridge Route - CiclaValley
View of the Ridge Route (Castaic-Tejon Route), a two-lane highway between Los Angeles and Bakersfield, California, USA -- Serpentine Drive. 1921 Stock Photo - Alamy
Ridge Route - Wikipedia
Why a historic highway that united California's two halves may never reopen to cars - Los Angeles Times
Trail Ridge Road | Travel Channel
From Footpaths to the Grapevine: A Brief History of Southern California's Ridge Route | Lost LA | Food & Discovery | KCET
Ridge Route Ultra
Ridge Route - Wikipedia
Historical Hike Along the Old Ridge Route – Santa Clarita Valley Historical Society