The initial alignment of California State Route 1 was commissioned in Watsonville and Pajaro area when the Sign Routes were announced in August 1934. The northbound highway originally followed Salinas Road, Porter Drive, Main Street and Freedom Boulevard through the two communities. The first realignment came in 1942 when highway north of downtown Watsonville was realigned onto an expressway to Rob Roy Junction. The highway would be modernized into a full freeway bypass during the 1960s. Former surface segments of California State Route 1 in the Watsonville/Pajaro area have since been recycled into County Route G12 and California State Route 152.
Pictured as the blog cover is the then new three lane alignment of California State Route 1 between Watsonville and Rob Roy Junction as seen in the November 1942 California Highways & Public Works.
https://www.gribblenation.org/2025/01/the-former-surface-alignment-of.html?m=1