The vehicle went down near the Arrow Highway exit around 2:13 p.m., according to fire officials.
UPDATE: #Irwindale "Arrow IC" 2 Pts taken by @LACoFireAirOps copter to Trauma Center, 1 Pt by ground ambulance to Trauma Center.
— LACounty Fire PIO (@LACoFDPIO) April 9, 2016
Officials said it appeared the vehicle hit a light pole, knocked it over and then fell down the embankment. The accident may have been weather-related, according to the CHP.
Two patients were taken by an emergency crew helicopter to a local trauma center, and the third was taken by ground ambulance, Los Angeles County fire officials said.