Authorities say the boy's 3-year-old sibling was also in the car.
Another driver reportedly saw 31-year-old Donneka Abraham's son driving on the freeway, and got in front of the car so the boy would stop.
When officers arrived, they noticed a 3-year-old inside of the vehicle without a car seat.
Abraham told officers that she was feeling dizzy following a trip to Walmart and decided to let the boy drive home.
She was charged with endangering a child, and later released on a $7,500 bond.