A road tunnel security system comprising a road security server system in communication with respective tunnel security client systems arranged and associated with respective cars Is disclosed, A specific tunnel security client system Is configured to download a computer coded road map from the road security server system, comprising at least one tunnel. A first virtual gate is located in front of a first tunnel opening, and a second virtual gate is located In front of a second tunnel opening. When a car is entering the tunnel, the first virtual gate submits the licence number plate to the road security system, and when the car is leaving the tunnel the registered licence number plate is deleted on request from the second virtual gate. In this manner the road security server keep track of ail cars and their license plate numbers that are inside the tunnel at any time.
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