1. A method for recognizing road signs in a vicinity of a vehicle and for synchronizing to road sign information from a digital map, comprising: generating, in the case of a recognition of a road sign, road-sign recognition data; providing navigation data for localizing the vehicle in digital map data; synchronizing the road-sign recognition data to the map data; deciding, in the case of a discrepancy between road-sign data derived from the map data and the road-sign recognition data, whether to output in the vehicle the road-sign data from the digital map or the road-sign recognition data in the vehicle, with the aid of at least one reliability factor, wherein existence of road sign data from the digital map indicated by information “road sign present” has a lower reliability factor, and existence of road-sign recognition data indicated by information “no road sign present” has a higher reliability factor; and outputting road sign data in the vehicle based on the deciding.