Category: State

CARxR 1.11: Highway NamingCARxR 1.11: Highway Naming

In our penultimate episode of the season, we explore highways and their names. Tom and Daniel discuss how highways got their names in the past, as well as how highways are named today through the legislature. You’ll see a discussion of historical names, destination-based names, and memorial names. We’ll also explore auto trail names, as well as some of the more notorious names that highways have been given. Lastly, listen until after the end credits for a discussion about an aspect of naming that people often forget.

Our last episode in the season will explore the organizations related to the state highways. We’ll then have a short hiatus while we write season two, and then we’ll start exploring the California state highway system, route by route.

Here’s the link to the show:

And here’s the link on Spotify for Podcasters:


CARxR 1.07: Highway Numbering: State Highways and Post MilesCARxR 1.07: Highway Numbering: State Highways and Post Miles

In this episode, we explore numbering systems in state highways. It is the start of a four part miniseries on highway numbers in California. Specifically, this episode explores the rhymes and reason for the assigning of signed route numbers to highways with the state shield. This includes looking at the patterns in those numbers, and how the numbering system stands today after the Great Nenumbering. The subsequent episodes in the miniseries will explore the numbering system of US Highways, the numbering of and the history of California’s Interstates, and the signed county route system.

The episode also explores another numbering system on state highways: Post Miles. As opposed to sequential mileage numbers as is found in other states, California uses a system called post miles that identifies points along a highway using a combination of a county and a mile point from the southern/western county line, possibly with clarifying prefixes or suffixes. We discuss this system is good detail.

Our interview is with Andy Richardson, who retired from Caltrans as a Subject Matter Expert in Geographical Information Systems, Linear Referencing Systems, and Postmiles. Andy worked as a GIS specialist for the State of California since 1988, including Caltrans between 2001 and his retirement in 2021. In his last years at Caltrans, he implemented the Department’s current Linear Referencing System.

Here’s the link to the show:

And here’s the link on Anchor.FM:


Episode 0.02 – Route 105 – It Only Takes a Century (Sample Episode)Episode 0.02 – Route 105 – It Only Takes a Century (Sample Episode)

This is a sample episode to show what the Route by Route format will be, as we don’t expect to start exploring routes until the second season. The first season will be mostly background: The history of the California State Highway system, explorations of how highways are numbers, exploring how highways are named, and the entities you’ll be hearing about in the episodes, such as the CTC. But we know you want the routes, so we decided to do a sample one for you. This episode focuses on Route 105.

The episode covers the following topics:

  • Legislative Route 105
  • 1965-1968 Interstate 105
  • Post 1968 Interstate 105 – The Century Freeway
  • Why I-105 doesn’t end at I-5
  • The construction and the consent decree
  • Names on the Highway
  • Significant Problems
  • Major Current Projects

Here’s the link to the show:

Here’s a link to the show on