A communication network comprising: a first unmanned aerial vehicle, the first unmanned aerial vehicle having a first flight control system adapted to control flight of the first unmanned aerial vehicle, the first unmanned aerial vehicle having a first cellular communication signal receiver adapted to receive cellular communication signals, and the first unmanned aerial vehicle having a first cellular communication signal transmitter adapted to transmit cellular communication signals; a control base, the control base having a control transmitter adapted to transmit control signals to the first flight control system for controlling a flight of the first unmanned aerial vehicle; a cellular communication base, the cellular communication base having a cellular communication receiver adapted to receive cellular communication signals and a cellular communication transmitter adapted to transmit cellular communication signals to the first unmanned aerial vehicle; and a second unmanned aerial vehicle, the second unmanned aerial vehicle having a second cellular communication signal receiver adapted to receive a cellular communication signal transmitted from the first cellular communication signal transmitter, and the second unmanned aerial vehicle having a second cellular communication signal transmitter adapted to transmit cellular communication signals received from the first cellular communication signal transmitter, wherein the second unmanned aerial vehicle having a second flight control system with pre-programmed control signals that autonomously control flight of the second unmanned aerial vehicle, wherein the second unmanned aerial vehicle is arranged to fly beyond a range of communication of the control base, but within a line of sight or line of cellular communication with the first unmanned aerial vehicle, characterized in that the second unmanned aerial vehicle has a sensor turret arranged to sense vehicles on the ground and wherein the second unmanned aerial vehicle is adapted to communicate any sensed information through cellular communication signals from the second unmanned aerial vehicle to the first unmanned aerial vehicle and wherein the first unmanned aerial vehicle is further adapted to communicate the sensed information from the first unmanned aerial vehicle to the cellular communications base. a first unmanned aerial vehicle, the first unmanned aerial vehicle having a first flight control system adapted to control flight of the first unmanned aerial vehicle, the first unmanned aerial vehicle having a first cellular communication signal receiver adapted to receive cellular communication signals, and the first unmanned aerial vehicle having a first cellular communication signal transmitter adapted to transmit cellular communication signals; a control base, the control base having a control transmitter adapted to transmit control signals to the first flight control system for controlling a flight of the first unmanned aerial vehicle; a cellular communication base, the cellular communication base having a cellular communication receiver adapted to receive cellular communication signals and a cellular communication transmitter adapted to transmit cellular communication signals to the first unmanned aerial vehicle; and a second unmanned aerial vehicle, the second unmanned aerial vehicle having a second cellular communication signal receiver adapted to receive a cellular communication signal transmitted from the first cellular communication signal transmitter, and the second unmanned aerial vehicle having a second cellular communication signal transmitter adapted to transmit cellular communication signals received from the first cellular communication signal transmitter, wherein the second unmanned aerial vehicle having a second flight control system with pre-programmed control signals that autonomously control flight of the second unmanned aerial vehicle, wherein the second unmanned aerial vehicle is arranged to fly beyond a range of communication of the control base, but within a line of sight or line of cellular communication with the first unmanned aerial vehicle, characterized in that the second unmanned aerial vehicle has a sensor turret arranged to sense vehicles on the ground and wherein the second unmanned aerial vehicle is adapted to communicate any sensed information through cellular communication signals from the second unmanned aerial vehicle to the first unmanned aerial vehicle and wherein the first unmanned aerial vehicle is further adapted to communicate the sensed information from the first unmanned aerial vehicle to the cellular communications base.