Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for implementing a road condition reporter are disclosed. In one aspect, a method includes the actions of receiving, from a computing device, data that reflects characteristics of a vehicle. The actions further include, based on the data that reflects the characteristics of the vehicle, determining a characteristic of a road traveled by the vehicle. The actions further include, based on the characteristic of the road traveled by the vehicle, generating an instruction to perform an action. The actions further include providing, for output, the instruction to perform the action.