Around the Bay Area, freeways early this afternoon were jammed with heavy slowdowns and stop-and-go traffic as motorists headed into San Francisco for an epic weekend of sports, music and culture.
The Metropolitan Transportation website, 511.org, reported that traffic was slow on most major highways. Both directions of Interstate 580 in San Leandro, Hayward and Castro Valley had moderate to heavy traffic, and there was some slowing on Interstate 238 in both directions. Highway 24 in both directions was clogged.
There was heavy traffic on Interstate 101 in both directions around Geary Boulevard, Van Ness and Mission Street avenues and other downtown off-ramps. Traffic was moving at least 10 miles per hour slower than the speed limits of 25 mph to 30 mph in those areas.
It was stop-and-go traffic on Highway 92 in both directions between Skyline Boulevard and Main Street.
With all that's going on, there could be up to a million extra people in the densely populated city of 800,000.
BART is running up to a dozen special event trains and longer trains all day Saturday and Sunday and will have extra station agents on duty to help passengers and more technicians on duty to keep equipment operating efficiently. People should walk, bike and carpool if at all possible, transportation officials said.
Crowds are heading into the East Bay and San Francisco for Fleet Week activities, the Hardly Strictly Bluegrass festival, America's Cup races, concerts at East Bay music venues, Stanford and UC Berkeley home games, Giants baseball and a slate of parades and street fairs.
The National Weather Service says a pleasant fall weekend can be expected around the Bay Area after the recent warm spell.
Check back for updates.