Vehicle Floor System

An embodiment vehicle floor system includes a floor, a pair of side longitudinal members disposed on side edges of the floor, respectively, wherein each side longitudinal member extends in a longitudinal direction of a vehicle and wherein each side longitudinal member includes a horizontal rib provided therein, a structural transverse member disposed on the floor and extending in a transverse direction of the vehicle, wherein the horizontal ribs are aligned with the structural transverse member in the transverse direction of the vehicle, and a battery assembly disposed under the floor.