An intoxicated Oklahoma woman was arrested after she drunkenly fell off out of the pickup truck that she was driving at a four-lane highway in Ada Wednesday, forcing her 3-year-old son to steer the wheel to safety.

Witnesses saw how the toddler took the wheel and manoeuvred the pickup truck across four traffic lanes after his mother Taloa Foster dropped from the vehicle, according to BBC News.

The vehicle eventually crashed into a curb. The toddler's twin brother was also inside the vehicle when the incident happened, and both of them were left unharmed after it hit a curb.

Foster explained that she was trying to put on her son's seat belt. Witnesses saw how she was walking along the road when her toddler crashed the pickup truck.

The witnesses then comforted the twins after the crash while the police performed a sobriety test on Foster, the New York Daily News reported.

Ada City employees Jason Goodwin and Lyndon Sutton were driving a work truck when they came across the crash site and pulled over.

Goodwin turned around and switched on the flashing safety lights of the vehicle to prevent cars bound west from crashing onto the pickup truck and the twin boys.

Foster was arrested and charged with child endangerment, as well as driving under the influence of alcohol after troopers discovered an empty liquor bottle on the vehicle's floorboard, according to The Ada News.