Welcome to Caltrans District 4
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Since 5/2/07


Caltrans District 4 | 580 Deck Collapse

BULLETIN: Eastbound 580 is now open!

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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.


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. AC Transit's Line M carries bikes across the San Mateo-Hayward Bridge.


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 lanes PDF: 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.
  • Changeable message signs and highway advisory radios are activated in the bay area, Stockton and Sacramento areas.

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