AUDIO VISUAL, COMMUNICATIONS, SURVEILLANCE AND ALARM SYSTEMS FOR USE BY OPERATORS OR PASSENGERS OF ROAD OR RAIL VEHICLES TO ENABLE THEM TO BE FOREWARNED OF ANY HAZARDS AHEAD OF THEM ON A TRACK OR A ROAD, AND TO PROVIDE A DATA LINK CAPABLE OF READING, CALCULATING AND SENDING AUDIO AND VIDEO DATA TO A PROGRAMMABLE CONTROL UNIT FOR DISPLAYING, ACCEPTING, SORTING AND DOWNLOADING THE AUDIO AND VIDEO DATA, AND UPLOADING THIS DATA TO OPERATORS OR PASSENGERS OF ROAD OR RAIL VEHICLES ALL COMPRISING A RADIO TRANSCEIVER, AN AUDIO ENCODER AND DECODER CONNECTED TO AUDIO TRANSDUCERS, INPUT AND OUTPUT SOCKETS CONNECTED TO A COMMAND CONSOLE OR TELEMETRY CONTROL UNIT AND A VIDEO ENCODER AND DECODER CONNECTED TO A VIDEO CAMERA, VIDEO DISPLAY OR VCR; AUDIO AND RADIO RECEIVERS AND TRANSMITTERS; CAMCORDERS; PHOTOGRAPHIC CAMERAS; RADIOTELEGRAPHY APPARATUS AND ELECTRONIC REMOTE CONTROLS FOR USE BY OPERATORS OR PASSENGERS OF ROAD OR RAIL VEHICLES TO TRANSMIT AND RECEIVE VIDEO AND AUDIO DATA BETWEEN ROAD OR RAIL VEHICLES AND WAYSIDE RADIO ACCESS POINTS COMPRISING A RADIO TRANSCEIVER, AN AUDIO ENCODER AND DECODER CONNECTED TO AUDIO TRANSDUCERS, INPUT AND OUTPUT SOCKETS CONNECTED TO A COMMAND CONSOLE OR TELEMETRY CONTROL UNIT AND A VIDEO ENCODER AND DECODER CONNECTED TO A VIDEO CAMERA, VIDEO DISPLAY OR VCR; SIGNALING SYSTEMS COMPRISING SIGNALING PANELS, CONSOLES AND VIDEO MONITORS; TELEVISION SETS AND TELEVISION ANTENNAS FOR USE IN PROVIDING TRANSPORTATION, SECURITY AND SAFETY INFORMATION; TELECOMMUNICATIONS TRANSMITTERS AND TELECOMMUNICATIONS RECEIVERS ALL FOR USE WITH RADIO, TELEPHONE, SATELLITE, AND COMPUTER MODEMS USED IN COMPUTER NETWORKS AND RADIO BROADCASTING NETWORKS; VIDEO TELEPHONES, VIDEO RECEIVERS AND VIDEOCASSETTE RECORDERS