This study investigates the structural response of bridge deck slab overhang in a slab-on-girder bridge system due to transverse vehicle impact. Using the three-dimensional finite element method, a parametric study was conducted on the overhang to determine the applied moments and tensile forces due to transverse vehicle collision forces with the concrete barrier. The key parameters considered in this study included deck overhang of constant thickness and tapered shape with a span ranging from 1 to 3 m, barrier and overhang length in the direction of traffic ranging from 5 to 20 m, and concrete traffic barrier geometries, namely: TL-2 through TL-5. Based on the data generated from this study, reliable empirical equations for the applied moment and tensile for deck overhang design were developed. The developed equations were included in the forthcoming 2025 Canadian Highway Bridge Design Code edition.