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Recent Episodes
S4E4090 CA RxR 4.09: Route 12: Crossing the Wetlands
Episode 4.09 continues our exploration of Route 12 through an exploration of the middle section of the route: From Fairfield/Cordelia through the "Drive to Stay Alive" corridor, on through the…
S4E4080 CA RxR 4.08: Route 12: Sonoma and Napa
Episode 4.08 is the first of three episodes focusing on Route 12. We start by exploring LRN 12, which we visited before in our episodes on Route 8, for LRN 12 became I-8 between San Diego and El…
S4E4070 CA RxR 4.07: Route 11: From Pasadena to the Border
In Episode 4.07, we examine Route 11. We'll start by exploring LRN 11, which was essentially the first state highway, running from Sacramento to Placerville, later extended to run from Antioch to…
S4E4060 CA RxR 4.06: I-10: San Bernardino Freeway
Episode 4.06 continues our exploration of Route 10. Episode 4.05 covered the first segment of Route 10: The Santa Monica Freeway between Route 1 and the I-5/US 101 junction. This episode, 4.06,…
S4E4050 CA RxR 4.05: I-10: Santa Monica Freeway
With Episode 4.05, we turn our attention to Route 10. This first episode on Route 10 starts with an exploration of the 10th route (the last ordinal route we'll do), which was the Emigrant Gap…
S4E4040 CA RxR 4.04: Route 9: Pre-1964 - Milpitas to Castro Valley
Episode 4.04 is our second episode exploring Route 9, which in its post-1964 version runs from Santa Cruz to Saratoga and Los Gatos. Before 1964, Route 9 continued N up to the Mountain View area, and…
S4E4030 CA RxR 4.03: Route 9: Santa Cruz and Saratoga
Episode 4.03 starts a pair of episodes that explore Route 9, which in its post-1964 version runs from Santa Cruz to Saratoga and Los Gatos. Before 1964, Route 9 continued N up to the Mountain View…
S4E4020 CA RxR 4.02: I-8 and US 80 Between El Cajon and the Arizona Border
This is Episode 4.02, which continues our exploration of Route 8, better known as Interstate 8. In this episode, we focus on the portion of I-8 from La Mesa (just outside of San Diego) to the Arizona…
S4E4010 CA RxR 4.01: I-8, Former Route 109, Route 209, and US 80 in San Diego
Welcome to Season 4 of CA Highways: Route by Route. Episode 4.01 is the first half of our exploration of Route 8. This episode covers the 8th State Highway, which became LRN 36 and later Route 194.…
S3E3150 CA RxR 3.15: LA Metro Archives (Bonus)
A New Year's Gift for you: Our last Bonus Episode of Season 3. Episode 3.15 features an interview with Claire Kennedy, Archivist for the Los Angeles Metropolitan Transportation Agency (LA Metro). In…
S3E3140 CA RxR 3.14: Freeway Exit (Bonus)
Bonus Episode 3.14 continues our inter-season gap between Seasons 3 and 4. This episode we're sharing an episode of the excellent Freeway Exit podcast from KPBS San Diego. Freeway Exit, hosted by…
S3E3127 CA RxR 3.13: Fresno Flats (Bonus)
Episode 3.13 is our first bonus episode, bridging the gap while we write Season 4. This bonus episode is a presentation that our co-host, Tom Fearer, gave at the Fresno Flats museum back in May 2025.…
S3E3120 CA RxR 3.12: Route 7: From Long Beach to the Border
Episode 3.12 brings Season 3 to a close, modulo our bonus episodes. In Episode 3.12, we explore all things Route 7. As is our tradition, we start by looking into the 7th state highway, the Kings…
S3E3110 CA RxR 3.11: US 6: A Major Route no More
With Episode 3.11, we turn our attention to Route 6, better known as US 6. As is our tradition, we start by looking into the 6th state highway, and the LRN 6, and then the route that was originally…
S3E3100 CA RxR 3.10: I-5: Gateway to Oregon
Episode 3.10 completes our exploration of I-5, looking at the segment that was former US 99, LRN 3, between Red Bluff and the Oregon Border. Along the way, we visit Red Bluff, Anderson and Redding,…
S3E3090 CA RxR 3.09: I-5: Former US 99W
Episode 3.09 continues our exploration of I-5 with the segment from Sacramento to Red Bluff, which primarily incorporates the former LRN 7 / US 99W routing between Woodland and Red Bluff, and a new…
S3E3080 CA RxR 3.08: I-5: Whatever Happened to I-5W
Episode 3.08 continues our exploration of I-5 with a slight digression: A discussion about I-5W. In the late 1950s, I-5W was proposed as a spur route from I-5 running along what is today Route 132,…
S3E3070 CA RxR 3.07: I-5: The Central Valley
Next up in our exploration of I-5: the segment between the I-5 / Route 99 split and where I-5 meets former US 99W (now Route 113) in Woodland. Generally known as the "Westside Highway", this was…
S3E3062 CA RxR 3.06p2: I-5: Whatever Became of the Ridge Route? (Part 2)
Our I-5 exploration continues, with a focus on the segment of I-5 from the US 101 split in Downtown Los Angeles to the Route 99 split in Wheeler Ridge. This episode, Part 2 of 3.06, completes the…
S3E3061 CA RxR 3.06p1: I-5: Whatever Became of the Ridge Route? (Part 1)
Our I-5 exploration continues, with a focus on the segment of I-5 from the US 101 split in Downtown Los Angeles to the Route 99 split in Wheeler Ridge. This episode, Part 1 of 3.06, after a recap on…
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California Highways: Route by Route has published 55 episodes since April 2022, covering topics in History.
California Highways: Route by Route is currently highly active with new episodes monthly. Average episode length is 50m.
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