Cajon Blvd / Old Route 66:.
View of the foothills from Rancho Cucamonga:
Hamner Ave just before the Santa Ana River:
Palisades Ave in Corona:
The directions below start from Wrightwood, although they can be easily modified to for crossing the Cajon Pass from the High Desert. Cyclists are allowed to use I-15 between Oak Hills Road and Cleghorn Road, as there is no other paved route in the area.