Welcome to Caltrans District 4



Carpooling is a smart choice. One advantage is that you can drive in the High Occupancy Vehicle (HOV) lanes. Most carpool lanes (HOV) require a minimum of two persons per vehicle, but some lanes require three persons. Another advantage is free toll on state owned bridges during commute hours.
  • Talk to your co-workers, friends and neighbors about forming carpools.
  • Use the many Park and Ride lots located adjacent to freeways to meet up with other carpoolers.
  • Use the Regional Rideshare Service to find people who want to form carpools.
  • Park at BART stations. BART is keeping its parking lots open.


The bridge approaches may become heavily congested. Plan ahead to reduce stress and travel times.

  • Adjust your schedule to avoid peak hours.
  • Get Fastrak, which reduces the toll collection processing time.
  • Take the bus. Many transit operators offer transbay service.
  • Ride your bike. Caltrans offers a shuttle service between the MacArthur BART station in Oakland and the Transbay Terminal in San Francisco. Caltrans will add a second bike shuttle during the commute periods. AC Transit's Line M carries bikes across the San Mateo-Hayward Bridge.
Toll Plaza Approach Graphics




Sunol Grade
Bay Bridge East
Bay Bridge East
E80 Ashby
E80 Ashby
92 San Mateo
92 San Mateo
Potrero 101
Potrero 101
Golden gate
Golden Gate



Caltrans will fully deploy all field personnel to monitor traffic conditions and adjust traffic control measures to help alleviate congestion where possible. This includes:

HOV Map HOV lanes
  • High Occupancy Vehicle (HOV) lane hours of operation are posted on freeways where there are HOV lanes. People sharing rides means less vehicles on the road which results in reduced volumes of traffic and smoother commutes.
  • West Grand HOV On-Ramp: Access to the Bay Bridge and eastbound 580 from the West Grand Avenue on-ramp in Oakland will be restricted to buses, carpools (3+ passengers), commercial trucks, and FasTrak in the event of a BART strike. The restriction will be between 5 a.m. – 10 a.m. and from 3 p.m.– 7 p.m. Mondays through Fridays.
  • Vehicle occupancy minimums are two persons on most freeways but three persons on Interstate 80.
  • California Highway Patrol officers will enforce these hours and vehicle capacities.
  • Lane closures: all construction and maintenance activities will be deferred to off-peak hours, night work or to a later date.
  • Changeable Message Signs (CMS): will post useful information such as traffic incidents, real travel time, Park and Ride lot locations and other sources for commute options, and the message can be changed in a matter of minutes, which makes it easy to provide up to date, real time traffic information.
  • Freeway Service Patrol (FSP): Tow trucks will be operating longer hours to help clear incidents, stalls and accidents on major freeways. These hours are approximately 5AM to 10AM and 2PM to 7:30PM.