Reivindicaciones

1. Safety system for vehicles which, using a GPS module for locating the position of the vehicle, is characterized in that it comprises: a) a device situated in the vehicle which sends/receives digital messages to/from a control centre via the GSM communications system, b) means situated in the device for transmitting the position of the vehicle to the control centre, either in response to a message from the control centre, or by activation of alarm means situated in the device c) means situated in the control centre which make it possible to obtain the relevant information from the vehicles and the geographical area covered by the system, and its processing together with the information received/transmitted from/to the vehicle. 2. Safety system according to Claim 1, characterized in that the transmission/reception of information between the device of the vehicle and the control centre is carried out in the form of brief data messages, via the short message service of the GSM network, using the support of a short message service centre of the GSM network for storing and distributing the messages. 3. Safety system for vehicles, according to the preceding claims, characterized in that the means situated in the control centre comprise a computer system which processes the information received/transmitted from/to the vehicle and that recovered from databases with information on the range of vehicles incorporated in the system and on the geographical area covered by the system, and an interconnection which allows the operator of the control centre to carry out the actions scheduled for each safety function provided by the system. 4. Device located in a vehicle for transmitting/receiving information to/from a control centre, consisting of three modules, a GPS receiver Module, a Control and Processing Module, and a communications Module, characterized in that: a) the control and processing Module comprises means for controlling the operation of the GPS receiver module and processing the positional information on the vehicle supplied by the said module in a form suitable for digital transmission thereof, b) the control and processing Module comprises means for transmitting/receiving information to/from devices for automatic processing of information and sensor devices connected to the system, c) the communications Module comprises means for supporting the functionality of the short message service of the GSM network and for being connected to the control and processing module in asynchronous mode.