Just east of the Cajon Summit is where the historic traffic corridor in and out of the Mojave Desert narrows and the various alignments come within hollering distance of each other as they cross over the divide between the high desert and Cajon Canyon.

Traces and fragments of footpaths, trails, wagon roads and early highways can be found next to our modern freeway and here they become interwoven, laced and worn or grown over. None of all of this, by any means, obscures the vision of countless travelers of past ages passing this point.

https://digital-desert.com/cajon-pass/