A roadway hazard warning assembly for enhancing visibility of a disabled vehicle on a roadway includes a vehicle that has been disabled on the side of a roadway. A warning flag is positionable on the vehicle when the vehicle becomes disabled on the roadway. The warning flag has light reflecting properties for reflecting light from headlights of oncoming traffic. In this way the warning flag can alert the oncoming traffic to the disabled vehicle. A plurality of fastening straps is provided and each of the fastening straps is removably coupled between the warning flag and the vehicle for retaining the warning flag on the vehicle.