A woman was killed and her 31-year-old son was seriously injured in a two-vehicle accident on Farrington Highway in Waipahu Wednesday afternoon.

Honolulu police said the man was driving an SUV eastbound on Farrington Highway when he rear-ended a Toyota sedan driven by 74-year-old woman who had just “exited the driveway entrance” of the Servco Auto Leeward onto the highway.

The impact caused the Lexus SUV to veer onto the median where it overturned and came to a stop on the westbound side of the highway.

The SUV’s 63-year-old female passenger suffered critical head injuries, was treated by Honolulu Emergency Medical Services personnel and taken to a hospital in critical condition where she died. The driver, her son, suffered injuries to his head and shoulder, and was taken to the hospital in serious condition, authorities said.

The Honolulu Fire Department said the man was able to get out himself, but his mother was still inside, and HFD personnel removed her through a window.

Police said it appears that neither of them were wearing seat belts.

The Toyota driver remained at the scene and had minor injuries but refused medical treatment.

Speed, drugs, and alcohol did not appear to be contributing factors, according to police who continue to investigate the crash.

This was the 13th traffic fatality on Oahu this year, compared with nine at this time last year.

The Honolulu Police Department closed the highway in both directions between Waipahu Depot and Mokuola streets as emergency crews responded and investigated.