Processing arrangement for managing temporary updates to a map for use by vehicular navigation systems in vehicles in which a communications system at a remote site receives wireless communications from each vehicle including 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 and that affects movement of vehicles on a roadway. A processor generates a map update for use by vehicular navigation systems based on the identified object or condition at the specific location which is transmitted 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.