1930s
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![Black and white image of sloping coastline with a highway winding along it.](/-/media/dot-media/programs/public-affairs/images/ct-history/1930s-pch-hwy1-big-sur-w607-h385.jpg?mw=368&hash=A3E25CC5AEA8B2AF863281FC844C2832)
1937
State Route 1, also known as the Pacific Coast Highway, was completed and served as an important tourist and commercial corridor. This is was California's first complete north-south highway.
![Spectators and automobile parade celebrating opening day of the San Francisco-Oakland Bay Bridge – Nov. 12, 1936.](/-/media/dot-media/programs/public-affairs/images/ct-history/1936-opening-day-sfobb-2x3.jpg?mw=368&hash=0BDDF51187763B778154111B67940CA1)
1936
The San Francisco–Oakland Bay Bridge opened to traffic. The bridge represented a remarkable engineering and political achievement.
![California Route Shield Original Design](/-/media/dot-media/programs/public-affairs/images/ct-history/1934-ca-st-rt-shield-2x3.jpg?mw=368&hash=F64CF42D5CA3231469EF82CF1A4D8F59)
1934
The state sign route numbering system was adopted.