California State Route 84

State Route 84
Route information
Defined by
Maintained by Caltrans
Length:	96 mi (154 km)
Restrictions:	Special restrictions No hazardous material in the Sunol Valley between SR 238 and I-680 No tractor-trailers or vehicles over 16.25 tons on the Ryer Island Ferry. Length restrictions may also apply.
Section 1
West end:	SR 1 at San Gregorio
Major junctions:	I-280 at Woodside US 101 in Redwood City I-880 in Fremont SR 238 in Fremont I-680 near Sunol
East end:	I-580 in Livermore
Section 2
South end:	SR 12 in Rio Vista
North end:	I-80 in West Sacramento
Highway system
State highways in California Interstate U.S. State Pre-1964 History Unconstructed Deleted Freeway Scenic ← SR 83 SR 85 →

State Route 84 (SR 84) is a split-section California State Highway consisting of two sections. The first section is an east–west arterial road running from San Gregorio to Menlo Park, across the Dumbarton Bridge through Fremont and Newark and ending at I-580 in Livermore. The route overlaps the freeway segment of US 101 between Woodside Road in Redwood City and Marsh Road in Menlo Park. The segment between Marsh Road and the Dumbarton Bridge has been upgraded to an expressway and is known as the Bayfront Expressway. The segment from the eastern end of the Dumbarton Bridge to the interchange with I-880 has been upgraded to a freeway.

The other section is a north-south arterial road that begins at SR 12 in Rio Vista, passes through Ryer Island (where it connects to SR 220), and ends at the I-80 interchange in West Sacramento. A ferry provides the crossing over Cache Slough from Rio Vista to Ryer Island. The ferry, a diesel-powered boat operated by Caltrans, is in operation twenty-four hours per day and charges no toll.