All of the following photos are being uploaded from Tapatalk. All of the following photos are from my 1940 Rand McNally Atlas. They have full credit of this material. Also, US 48, US 101W, and US 101E (with the latter two having had been split suffixed U.S. Routes in the Bay Area) are not visible in this map, since it is from 1940 (after all of those Highways became defunct in California).
The roads in the Los Angeles Metro Area, zoomed out:

A zoomed out view of the roads in the Los Angeles and San Diego areas. Here it can be seen how far south US Highways 101 and 395 used to go, and the former existence of US Highway 80 in California:

A close up, now, of this very sight:

Here you can see a closer view of Los Angeles. Here you can see how US 66 and US 6 made their ways into the Los Angeles area back in the day, after their respective treks across the country. You can also see US Highway 99 back when it was in existence, and how it traversed that part of the land - regarding that, you can even see the multi-lane section of US 99 that was right directly south of Bakersfield, which itself is not visible in this specific picture - of course, way back then, multi-lane Highways were much, much rarer across the country (according to this very Atlas) and would have definitely been a special treat to see. US 101 ALT is also visible (as well as US 101 itself, of course), and it presumably followed the route that California Highway 1 traverses today in that area (according to how it looks on the map). Much more than even all that is visible as well:

Here you can see a very close view of Long Beach. Here you can see Highways such as US 6 and US 101 ALT:

Here you can see the part of the Los Angeles Metro Area that encompasses Anaheim, Whittier, and more. In the top left corner of the picture, you can see a lot of different US Highways, as this is near downtown Los Angeles:

Here you can see a close up of Ontario. Here you can see roads such as US 60, US 70, US 99, US 66, and California Highway 71:

Here you can see a close up of Glendale, Pasadena, Burbank, downtown Los Angeles, and more:

Here you can see the Coast just southwest of downtown Los Angeles. Here you can see Santa Monica, which was the western terminus of US Highway 66 (and it is also the western terminus of Interstate 10 now in the modern day):

Here you can see a close view of Bakersfield. Here you can see US 99, US 399, US 466, and more:
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