Implementations described herein disclose a road hazard detection method including receiving a plurality of mobile device sensor signals from one or more sensors located on a mobile device within a vehicle, determining the road hazard encountered by the vehicle by analyzing the plurality of mobile device sensor signals, and reporting the existence of the road hazard to other users. In one implementation, the road hazard detection method also uses sensor signals from various sensors located on the vehicle and/or sensor signals from mobile devices of users on other vehicles to determine the road hazard.