A jack-knifed truck blocked three eastbound lanes of Interstate 80 on the Bay Bridge for three hours.
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By rush-hour, drivers on city streets said it was taking two hours just to get on the bridge.
SFMTA says they converted 25 parking control officers into traffic flow officers at 25 key intersections.
They could alter the signals and keep intersections from being blocked, but it wasn't enough. Actually, it's never enough. 60% of the congestion in the Bay Area is due to accidents like that one.
"There's really nothing you can do once people are on the road," UC Berkeley Engineering and Computer Science Professor Alex Bayen said. "It piles up. People have to go to the bridge, to go where they're going," he said.
Bayden says it's not a city problem or a freeway problem. He said the point is, if you are a motorist, you've got to check traffic before you leave.
"There's a hope with traffic information systems that people learn every time you have to cross a key point of the Bay Area, bridge, you just track traffic before. And if the traffic is as bad as yesterday don't hit the road."
But that's easier said than done, according to SFMTA spokesperson Paul Rose.
"The timing of the accident made it especially bad in the afternoon," he said.
"If it's during the morning commute you can make decisions about BART, Muni, or alternate transportation. But if you have already driven in, what do you do with your car if it's left overnight?"
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The traffic could get worse once development on Treasure Island adds up to 24,000 new commuters over the next 17 years.
Hope hangs on new technology, technology that could reallocate lanes, control more traffic lights, and connect directly with self-driving vehicles.
In the future, if you are in a self-driving car, technology could take it over, force it to stop, and go at intervals as part of a master plan to help traffic flow.