What's so amazing to me is the lack of center dividers on many of the early roads. Imagine travelling along at 75-80 and 24 feet away was a car doing the same thing in the opposite direction.
As far as the compare photos, it looks like they've completely redesigned the interchange? The first "today" photo showed the sign and the beginning of an offramp. This photo is taken from the ramp. You can see an overpass like in the B&W picture but 405 curves as it passes under the ramp.
https://cdn2.lamag.com/wp-content/up...rn-Fwy-map.jpg
Kind of crazy to think about how much effort was spent building and rebuilding in such a short time. That type of activity makes ants proud! ;-)