A couple of shots using HistoricAerials.com to generate a few looks at one of the oldest interchange sites (though not oldest interchange remaining, per se) in the United States:
1946:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.historicaerials.com%2FfeaturedPOIImage.aspx%3Fpoi%3D12687&hash=e9abfd768aba7b4f7c6384e4b81d27483a24e211)
http://www.historicaerials.com/featuredPOIImage.aspx?poi=12687
closeup:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.historicaerials.com%2FfeaturedPOIImage.aspx%3Fpoi%3D12690&hash=603cfbc9d56f20e72e5a2031e8b8587363b93a5e)
http://www.historicaerials.com/?poi=12690
1959:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.historicaerials.com%2FfeaturedPOIImage.aspx%3Fpoi%3D12688&hash=1b23844cc69634e6f77b83fc18805ffb24641900)
http://www.historicaerials.com/?poi=12688
closeup:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.historicaerials.com%2FfeaturedPOIImage.aspx%3Fpoi%3D12689&hash=85017106f017a829f5a734e368d0e78bd3171bc8)
http://www.historicaerials.com/?poi=12689
Distribution Structure for the win!
Here's a vintage map of the interchange, ca. 1949 (as part of a proposal to widen the Bay Bridge back then), showing the original ramp configuration!
http://www.flickr.com/photos/walkingsf/4235065439/sizes/l/in/photostream/