Although not given specific screen credit, the California Highway Patrol was pleased to give technical advice on the production, even as far as providing all the patrol vehicles used in the series, and uniforms, too (modified to remove all references to California). http://www.imdb.com/title/tt0047739/trivia

The series' opening credits originally expressed appreciation to Bernard R. Caldwell (the head of the California Highway Patrol during the mid-1950s) for technical advice and assistance, much of which was provided on-site by CHP Officer Frank Runyon. After the initial seasons, Mr. Runyon continued to serve as a technical advisor but the CHP reduced its official support for the program. The opening expression of gratitude thus became more "generic". It read: "This program is dedicated to the Highway Patrols throughout the nation and their contribution to the safeguarding of public welfare. We are deeply grateful for the technical advice and assistance which made the authentic production of this program possible." http://www.imdb.com/title/tt0047739/trivia

Check out this link from Google Streetview:
http://maps.google.com/maps?q=22000+ave+san+luis+los+angeles,ca&ie=UTF8&hq=&hnear=22000+Ave+San+Luis,+Los+Angeles,+California+91364&gl=us&ei=9u-bTOauHMOclgeU95D5CQ&ved=0CBQQ8gEwAA&ll=34.165962,-118.605926&spn=0.010031,0.01929&z=16&layer=c&cbll=34.165962,-118.606045&panoid=3ZaYre0wU6KAZFxYy2ZAUg&cbp=12,321.24,,0,-2.69
This looks like the same building on the corner of Topanga Canyon and San Luis Ave. Wehn Dan drives away down the street, you can move Streetview and see many of the buildings are the same. That huge tree is still there today in Streetview.Great Show!