Overturned vehicle snarls traffic on Highway 101 near San Francisco

A severe traffic alert was issued early Monday morning for Highway 101 just north of Candlestick in San Francisco after a collision involving two vehicles caused one of them to overturn and block the right lanes, officials said. less A severe traffic alert was issued early Monday morning for Highway 101 just north of Candlestick in San Francisco after a collision involving two vehicles caused one of them to overturn and block the right ... more Photo: CalTrans Photo: CalTrans Image 1 of / 30 Caption Close Overturned vehicle snarls traffic on Highway 101 near San Francisco 1 / 30 Back to Gallery

A severe traffic alert issued early Monday morning for Highway 101 just north of Candlestick in San Francisco has been lifted after all lanes of the freeway were reopened.

Both the third and fourth northbound lanes were blocked and a SigAlert was issued at 6:01 a.m., after a collision involving two vehicles caused one of them to overturn and block the right lanes, according to the California Highway Patrol.

The lanes were reopened at 7:18 a.m., CHP said.

Josh Koehn is a San Francisco Chronicle staff writer. Email: josh.koehn@sfchronicle.com Twitter: @Josh_Koehn