1. A processing arrangement for managing temporary updates to a map for use by vehicular navigation systems in a plurality of vehicles, comprising: a communications system at a remote site that is configured to receive wireless communications from each of the vehicles that includes information about presence of an object or condition at a specific location automatically identified at the specific location without requiring manual entry of data about the object or condition at the specific location, the presence of the object or condition at the specific location affecting movement of vehicles on a roadway; and a processor coupled to said communications system and configured to generate an update for a map for use by the vehicular navigation systems based on the identified object or condition at the specific location included in the communications received by said communications system; said communications system being configured to transmit the generated map update to any vehicle in a vicinity of the specific location to cause the vehicular navigation system of that vehicle to use a map with the generated map update to display or otherwise indicate the presence of the object or condition at the specific location, said processor being further configured to: process wireless communications received from each of the vehicles using said communications system including information that the object or condition whose presence was previously detected at the specific location is absent at the specific location at a subsequent time after generation of the map update relating to the presence of that object or condition at the specific location, generate another update for a map for use by the vehicular navigation systems based on the absence of the object or condition at the specific location provided during processing of the wireless communications received from each of the vehicles using said communications system; and direct transmission of the another map update using said communications system to any vehicle in a vicinity of the specific location to cause the vehicular navigation system of the vehicles to use a map with the another map update to avoid display or indication of the presence of the object or condition at the specific location.