B757 Undifferentiated or Other Model
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Flight Crew Type 881
Situational Awareness
Conflict Ground Conflict; Critical; Ground Event / Encounter Other / Unknown
Flight Crew Took Evasive Action
Human Factors
Cleared [to] taxi. Taxi light on and two vehicles ignored light that could have easily stopped forcing us to delay taxi. After they passed I observed another vehicle in the distance and began my left turn. Best way to describe it is like coming to a 4 way stop. You have right of way and begin to enter intersection and another vehicle which should have stopped and could have easily decides not too. This forces you to slam on brakes to avoid collision. I had to call FA (Flight Attendant) to ensure everyone in back was OK.
B757 Captain reported performing an abrupt stop to avoid a collision with a ground vehicle during taxi at SFO.