The freeways alignment of US Route 101 in Arroyo Grande opened to traffic in 1959. Within the City of Pismo Beach the US Route 101 freeway opened in 1961. Arroyo Grande has two historic alignments of US Route 101; one that followed Branch Street-Bridge Street over the 1908 Arroyo Grande Creek Bridge and the other which followed Traffic Way. Historically US Route 101 prior to the completion of the current freeway followed Price Street.
https://www.gribblenation.org/2021/07/former-us-route-101-through-pismo-beach.html