Interstate 505 links Interstate 80 in Vacaville with Interstate 5 near Dunnigan via Winters. This route was originally part of proposed Interstate 5W but today is part of the most direct route from Interstate 5 in Northern California to Interstate 80 west to the San Francisco Bay Area. This reassurance shield is located after Exit 29 in rural Yolo County. Photo taken 03/31/05.
Interstate 505 connects Interstate 5 near Dunnigan with Interstate 80 near Vacaville via Winters. Originally conceived as part of Interstate 5W in 1964, Interstate 505 is a fast route from the San Francisco Bay Area to the Pacific Northwest.
Most of Interstate 505 in Solano County was built in 1974, with the Interstate 80-505 interchange built in 1968. Interstate 505 in Yolo County was mostly constructed as a two-lane highway in 1959, and it was expanded to four lanes in 1980. The northernmost section was constructed in 1977, with the Interstate 5-505 interchange built in 1968.