Mt. Diablo at Main -- Early 1950s
After the opening of Broadway Shopping Center in 1951, traffic on Main
Street and Mt. Diablo Boulevard was gridlocked every afternoon. Mt.
Diablo also served as Highway 24; Main Street served as both Highway 24 and
21. City officials used photos to “plead their case” for the State to build a
freeway bypass to ease congestion. Traffic relief came in 1960, when the new