THE 2006 TOYOTA PRIUS WAS BEING DRIVEN UP A HILL (PRIVATE ROAD WHICH WE HAVE ACCESS T)., WHEN THE CAR HIT AAN AEA OF LOOSE DIRT & GRAVEL. THIS CAR, A BASE MODEL PRIUS, HAS ANTI-SKID CONTROL, BUT NOT TRACTION CONTROL. THE BASE MODEL IN 2006 WAS THE ONLY ONE DESIGNED LIKE THIS. WHAT HAPPENS, IS WHEN THE ANTI-SKID KICKS IN, IT CUTS ALL POWER TO THE WHEELS. SINCE THE CAR WS HEADING UP A STEEP INCLINE, WHEN ALL POWER TO THE WHEELS WAS CUT, THE CAR ROLLED BACK DOWN AND OFF THE ROAD ITO THE WOODS AND TREES/ROCKS. I JUST FOUND OUT FROM MY INSURANCE COMPANY THE THE CAR IS A TOTAL LOSS FROM ALL THE DAMAGE TO VARIOUS PARTS. THIS PROBLEM NEVER AFFECTED US EXCEPT WHEN TRYING TO GET OUT OF THE DRIVEWAY ON SNOWY/ICY DAYS. NOW, WHEWN THIS INCIDENT HAPPENED, IT IS APPARENT THE CAR SHOULD NEVER HAVE BEEN SOLD OR DESIGNED IN THIS WAY