A cementing banana HGV was driving on a graded road in the Lekhwair area at night having travelled from Fahud. Driver did not negotiate the graded road curve and went straight crossing the left edge of the graded road (1.1 meter above the adjacent desert) at a speed of 60 KPH. As a result of dropping wheels for more than one meter height, truck rolled over 90 degrees on to left side. Driver suffered lost time injuries.