A system including at least one database for the storage of items of information, and an identifier of a first entity concerned by each item of information; and at least one interrogation station comprising elements for access to the database, there being elements for defining items of warning information amongst the items of information and elements for associating an emergency access code with the items of warning information. The access elements include elements for input of the emergency access code and elements for making available the warning information concerning a first entity without the identifier of the first entity being made available.