California Interstate 680
![California Interstate 680 sign.](img/CA/CA19796803i1.jpg)
1970 specification highway marker.
Northbound reassurance shield along scenic section in Contra Costa County.
Photo by Jeff Royston, 8/16/2003.
1970 specification highway marker.
Northbound reassurance shield along scenic section in Contra Costa County.
Photo by Jeff Royston, 8/16/2003.