To　address　the　shortcomings　of　dynamic　evaluation　methods　for　simply　supported　girder　bridges　under　moving　loads,　as　well　as　the　inefficiencies　of　traditional　dynamic　load　test　measurements,　which　are　time-consuming　and　labor-intensive,　this　paper　proposes　a　dynamic　evaluation　method　incorporating　the　contact　surface　effect　of　actual　wheels.　This　method　refines　a　vehicle-bridge　coupling　model　and　verifies　its　accuracy　through　dynamic　displacement　measurements　using　millimeter-wave　radar,　complemented　by　modal　analysis　and　dynamic　load　testing.　The　method　also　accounts　for　the　effects　of　bridge　deck　roughness,　vehicle　speed,　and　weight　on　the　impact　coefficient　of　the　bridge,　comparing　these　effects　with　those　outlined　in　the　current　code.　The　practical　application　of　this　method　demonstrates　that　millimeter-wave　radar,　as　a　novel　non-contact　testing　approach,　can　accurately　measure　the　complex　vibrations　of　bridges.　The　multi-point　contact　model　predicts　vehicle-bridge　interactions　more　precisely　than　the　single-point　contact　model,　particularly　under　poor　bridge　deck　conditions,　with　discrepancies　between　the　models　reaching　up　to　9.59%　on　Class　D　bridge　deck　roughness.　The　current　code,　which　calculates　the　impact　coefficient　considering　only　a　single　factor,　may　not　accurately　reflect　the　actual　impact　coefficient　of　the　bridge.　In　this　study,　an　impact　coefficient　regression　formula　is　also　derived　using　vehicle　speed　and　bridge　deck　roughness　as　independent　variables,　offering　a　tool　for　estimating　the　impact　coefficients　of　similar　bridges.