In the August 1934 California Highways & Public Works the Division of Highways announced the initial Sign State Route program. The Sign State Route program was intended to supplement the early US Route System in California by way of signing major highways with miner spade shaped highway shields. The original Sign State Route network contained numerous grouping patterns which largely have been lost as the system has expanded. This blog will examine the grouping patterns of the Sign State Route program as originally envisioned. Featured as the blog cover photo is the prototype Sign State Route shield seen in the August 1934 California Highways & Public Works.
Conventions of the original Sign State Route grid and grouping patterns
As noted in the introduction the August 1934 California Highways & Public Works announced the initial run of Sign State Routes. The initial Sign State Routes were assigned to corridors of travel that were largely considered essential to state-wise transportation. While most Sign State Routes were applied over State owned Legislative Route Numbers not all were (example: California State Route 180 west over Panoche Pass to California State Routes 25 in Paicines). The pages below contain descriptions for each Sign State Route.
San Francisco Bay Area North/South Grouping
The point of origin for the entire State Sign Route System appears to have been with California State Route 1 which passed through San Francisco along the Pacific Coast. Major north/south Sign State Routes east of San Franscisco were assigned as; 5, 9 and 13. Sign State Routes 25, 29, possibly 33 and 37 appear on the outskirts of San Francisco Bay Area. Notably Sign State Route 13 became Sign State Route 17 for unknown reasons shortly after the Sign State Route program was announced.