Free toll during what commute hours on San Francisco-Oakland Bay Bridge?

The San Francisco-Oakland Bay Bridge offers free tolls during specific hours for carpool vehicles. Typically, this free toll is available on weekdays from 5:00 AM to 9:00 AM and from 3:00 PM to 6:00 PM, provided that there are at least three passengers in the vehicle. It's always best to check the latest updates from the California Department of Transportation for any changes to these hours.