A bus driver bringing 40 Bay Area passengers to Graton Casino who was arrested on suspicion of DUI in Rohnert Park Sunday had a blood alcohol level nearly four times the legal limit, according to the CHP.

A passenger called 911 after driver Angela Teasley, 34, of Richmond, crashed into a guardrail traveling north on the Golden Gate Bridge around 9:25 a.m., said Officer Jon Sloat, CHP spokesman.

Teasley, driving a passenger bus marked with Graton Casino logos, didn’t stop, continuing north at excessive speeds passing vehicles on the right shoulder of Highway 101, Sloat said.

Other drivers who witnessed the bus’ maneuvers also called authorities.

Rohnert Park police stopped the bus around 10:15 a.m. as it pulled into the Graton Casino parking lot, Sloat said. CHP officers interviewed some of the passengers.

Following a DUI evaluation, Teasley was estimated to be nearly four times the legal limit of .08 percent blood alcohol content.

She was booked for driving under the influence and operating a commercial vehicle while impaired.

You can reach Staff Writer Nick Rahaim at 707-521-5203 or nick.rahaim@pressdemocrat.com. On Twitter @nrahaim.