Courtesy of Bob Ristelhueber:
https://www.facebook.com/groups/246840025517856/?multi_permalinks=2921326591402506&hoisted_section_header_type=recently_seen&__cft__[0]=AZWwgnERbIW8sob5yw0nsarUt1MsqlAq4eTRiVrzEFk-NWLdL6ZEaBQA3uCoAg5WeQzu2XewOrf2Ch0GLrzbYvO90CbqMQMDx5zXUT17Eqam-U0SCcgRdHQD0Lh2XoSRjMTOn7saCb9xgZEUudurQ-iFBtpkPiR9VunmJoZLJNqgfeQwfaB373O3n6hPcaAyWmBiWNSM8dwTqDBtCcLf8jxkcZFNcKbVq3X6tScfaZj-wcICwIuHuUAcZtDEBbNTlFqg4WuJMhJBIs7kMbR-XRpQxs8a0Cbk5pzu5b_rifrZdg&__tn__=%2CO%2CP-y-R
I have posted the shots on Flickr since facebook is hard to inline link:
https://www.flickr.com/photos/csampang/albums/72177720322170468
6 lane section in San Mateo, a commenter on FB noted the trees on the right may still be there today in 2024:
(https://live.staticflickr.com/65535/54163206436_a32e469dab_k.jpg) (https://flic.kr/p/2qwdAfQ)san mateo (https://flic.kr/p/2qwdAfQ) by Chris Sampang (https://www.flickr.com/photos/csampang/), on Flickr
The most notable of the scans for me: a photo of the still-extant Grand Avenue offramp from southbound Bayshore Freeway, with the curved overpass for now-101 (the curve is still there too but has been widened). What makes this photo rather special is that it shows that Los Angeles was signed as a control city as far north as South San Francisco, which I hadn't known about until this weekend!
(https://live.staticflickr.com/65535/54163665295_29dadf8154_k.jpg) (https://flic.kr/p/2qwfWEc)SSF Grand Avenue with Los Angeles sign (https://flic.kr/p/2qwfWEc) by Chris Sampang (https://www.flickr.com/photos/csampang/), on Flickr
The ramp merge points and split points are the same today as then, but how they connect to the surface streets has been altered drastically (the 1956 to 1982 era HistoricAerials overhead shots show the old at-grade railroad crossing of Grand Avenue here; the current ramp configuration with the Grand Avenue railroad grade separation dates to around 1987).