Here's the next episode of the podcast, on the rhyme and reason behind California's state highway numbers, and an exploration of the postmile system. You can find the podcast on all your favorite podcatchers and podcast apps, through anchor.fm, or the shows page linked below.
Show on CA Route by Route (https://caroutebyroute.org/2023/01/16/carxr-1-07-highway-numbering-state-highways-and-post-miles/)
Show on Anchor.FM (https://anchor.fm/caroutebyroute/episodes/CARxR-1-07-Highway-Numbering-State-Highways-and-Post-Miles-e1tid8j?%24web_only=true&_branch_match_id=610221735617887853&utm_source=web&utm_campaign=web-share&utm_medium=sharing&_branch_referrer=H4sIAAAAAAAAA8soKSkottLXLy7IL8lMq0zMS87IL9ItT03SSywo0MvJzMvWT9VPy830NDap8HApTwIAg4d%2BRDAAAAA%3D)
I encourage folks to look at the page on CA Route by Route -- I found a number of links to Caltrans GIS data that are of interest.
Please spread the word about the podcast to your friends -- we're still under 100 listeners and I'd like to get that number up (although I don't know how many listen directly through the show page). I'm also looking for a contact from American Association of State Highway and Transportation... who might like to speak on AASHTO's role in highway numbering.