The incident occurred at the fast food chain located on Brea Canyon at 1:18 a.m.
According to CHP officials, Officer Jonathan Chel, 29, was driving a black 2014 Mazda 3 on the 60 Freeway when he went off the side and landed at the McDonald's.
Chel was transported to UCI Medical Center with traumatic injuries, first responders said. After arriving at the hospital, Chel was determined to be under the influence of alcohol and was arrested, the CHP said.
