interstate california interstate north south interstate highway curves eastern cities interstate bypassing cities eastern shore oakland richmond serving inland concord built 1920s designated begins junction freeway heads northeast north northwest northeast passing state route abruptly turns northeast connection freeway planned enters hills valleys highway crosses known descends meets near heads north northwesterly valleys including fault junctions portion include dublin interchange way directional junction freeway west oakland heads north splits heads northwesterly junction highway crosses immediately meeting east end end remainder lies hilly area west representing southwestern tip area bay east route description california freeway expressway system route eligible county line scenic route designation unclear defines mission county line county line routed route near route passing near mission near route begins route joe interchange acts continuation eastward begins journey northward meets signed mile northeast southern terminus exit northbound known rock avenue unsigned intersection continues meets numerous local roads expressway exits enters city california meets referred boulevard intersection exits enters freeway begins city intersects unsigned continuing city meets exiting city prior ghost ramps existed remains abandoned freeway project replacing amid abruptly turns northeastward enters hilly area crosses descends runs concurrently short enters intersects currently california longest auxiliary interstate providing access oakland enters dublin short segment exiting county entering entering route meets numerous local roads cities entering meets enters pleasant hill short time concord meets exiting concord meets enters follows route crosses county line enters bridge northbound requires toll southbound free direction interchanges exits city passing rural areas routing parallel enters meets route northern terminus wake september attacks flag painted large piece concrete hill stayed years painted mural painted authorization action taken shortly july 4th mural fame met controversy flag replaced shortly later names designated portion usually appears maps portions maps unnamed referred simply high occupancy lanes mile southbound high occupancy toll hot lane opened september solo drivers required pay toll studies implementation northbound hot lanes currently underway exist portion slightly north concord portion leading requires car persons unlike california regular lanes persons history historic routing 1920s road ran south dublin met state highway route mission boulevard signed years paved south dublin crossed mission pass basin majority roadway added state highway system portions routes route mission san route route ferry took automobiles route original state highways bond issue led north northeast past sacramento oregon portion north route route realigned direct route aforementioned roads given state sign route numbers system laid numbered route began intersection brown road route route split followed route mission boulevard mission san later overlap continued route routing close present following roads san valley boulevard main street portion finally added state highway system branch route ferry approach spur route transferred route law effective immediately urgency measure authorized acquire ferry system operated city planning shut ownership transferred midnight october history interstate approved urban routes september including loop soon numbered east half began interchange north downtown followed freeway route split present location route sign route number piece freeway built pre existing freeway late 1950s overlap monument boulevard southerly extension bypassing downtown opened march connecting freeway oakland decade freeway completed south mission san roadway north remaining piece upgraded freeway standards renumbering legislative designation changed route officially moved route signed designation freeway constructed instead marked replaced north mission san remained signed freeway short lived approved shift south end october legislature changed routes routes south creating new short roadway overlapped switch sides completed early mid 1970s remained signed freeway old road continued marked change routing july remainder added new alignment old route corresponding changes state legislature interchange beginning route constructed years completion bridges ramps ramps stood foot tall monument years 1970s butt local jokes highlight prank occurred january chevrolet placed highest bridge overnight obviously impossible drive following day photographed standing car photo circulated newspapers suggested stunt wheels progress find funds complete freeway interchange named exit list letter measured road based alignment existed time necessarily reflect current mileage reflects realignment route indicates second realignment refers overlap correction change indicates classified temporary list list definitions segments remain relinquished local control omitted numbers reset county lines start end county given county column
Interstate 680 (California)