While operating 773 haul truck (equip# 1391) with a load, EE was driving down the Phase-2 haul road between the L-1 bench and H-3 bridge, the truck hit a bump in the haul road and EE tried to brace himself with his legs to cushion the bump. In that process he strained his inner right thigh. EE reported incident at the end of his shift on 1/28/13