A collision involving suspected drunken driving resulted in serious injuries May 31 in San Marcos, authorities reported.

The incident happened at about 7:30 p.m. when a 60-year-old woman driving a Toyota Prius sedan made a left turn in front of a motorcycle traveling westbound on East Mission Road, according to a report from the San Diego County Sheriff’s Department. The motorcyclist was unable to avoid the car and struck its side, ejecting the 42-year-old man and his 35-year-old female passenger, both of whom landed on the road.

The man was transported by the San Marcos Fire Department and airlifted to Sharp Memorial Hospital San Diego with serious injuries, the report stated. The woman, who was also injured, was transported to Scripps Memorial La Jolla Hospital for treatment.

A preliminary investigation indicated that the driver of the Prius was under the influence of alcohol while driving, the Sheriff’s Department reported. The driver was arrested on suspicion of driving while intoxicated with serious injury and booked into Vista Jail.

The traffic division of the San Marcos Sheriff’s Station is investigating.