I recently drove the entirety of Los Angeles County Route N2 this past weekend. N2 is an interesting route in that it incorporates some segments of the Old Ridge Route, El Camino Viejo and Stockton-Los Angeles Road. N2 is mostly known for being the corridor the planned but never constructed realignment of CA 138 was meant to be built through. All and all this was a pretty interesting route given the one-lane segment on Old Ridge Route/Pine Canyon Road in addition to the weird terrain caused by the San Andreas Fault.
https://www.gribblenation.org/2019/05/los-angeles-county-route-n2.html