I suggest that the route of NBR 70 from Barstow, CA to the Pacific coast follow the Mojave river (Old National Trails Highway) to San Bernardino. An all-paved route is available by following the river southeast from Victorville and then using CA 138 to meet Interstate15 at Cajon Junction. Approximately 1 mi of riding on the shoulder of Interstate 15 is necessary at present. Then the old Rt. 66 road is open to Devore.
From Devore west I suggest that 2 routes be considered, one staying near the north edge of the Los Angeles basin to Pasadena, Los Angeles and Santa Monica and the other continuing south to meet the Santa Ana River Trail. The north option can connect with several multiuse river trails or give access to many other LA suburb cities. I hope to get advice from local road maintenance agencies and bicycle clubs to choose detail routes.