An accessory module system suitable for use in a vehicle, the accessory module system comprising: a plurality of discrete fixing elements configured for adhesive attachment at a surface of a vehicle windshield; wherein, when adhesively attached at the surface of the vehicle windshield, the fixing elements are spaced apart from one another at the surface of the vehicle windshield; characterized in that: each of the,fixing elements comprises a portion that is configured for adhesive attachment at the surface of the vehicle windshield and a portion that extends from the portion adhesively attached at the surface of the vehicle windshield in a direction away from the vehicle windshield; an accessory module assembly for receiving an accessory and comprising a frame assembly; wherein the frame assembly defines a plurality of sites for the modular location of accessories within the frame assembly; wherein the accessory module assembly comprises a plurality of individual receiving portions that are positioned relative to one another in a manner that corresponds with the spacing of the fixing elements; wherein each one of the receiving portions is configured to receive a respective and corresponding portion of the fixing element that extends from the portion adhesively attached at the surface of the vehicle windshield in a direction away from the vehicle windshield; wherein the accessory module assembly and the fixing elements cooperate to retain the accessory module assembly at the vehicle windshield; wherein the accessory comprises a camera; wherein, when the accessory is received at the accessory module assembly, the line of vision of the camera passes through an aperture existing in the accessory module assembly; wherein, with the accessory received at the accessory module assembly and with the accessory assembly attached by the fixing elements at the vehicle windshield, the line of vision of the camera passes through the vehicle windshield; and wherein the accessory module assembly further comprises a cover assembly detachably connectable to the frame assembly. a plurality of discrete fixing elements configured for adhesive attachment at a surface of a vehicle windshield; wherein, when adhesively attached at the surface of the vehicle windshield, the fixing elements are spaced apart from one another at the surface of the vehicle windshield; characterized in that: each of the,fixing elements comprises a portion that is configured for adhesive attachment at the surface of the vehicle windshield and a portion that extends from the portion adhesively attached at the surface of the vehicle windshield in a direction away from the vehicle windshield; an accessory module assembly for receiving an accessory and comprising a frame assembly; wherein the frame assembly defines a plurality of sites for the modular location of accessories within the frame assembly; wherein the accessory module assembly comprises a plurality of individual receiving portions that are positioned relative to one another in a manner that corresponds with the spacing of the fixing elements; wherein each one of the receiving portions is configured to receive a respective and corresponding portion of the fixing element that extends from the portion adhesively attached at the surface of the vehicle windshield in a direction away from the vehicle windshield; wherein the accessory module assembly and the fixing elements cooperate to retain the accessory module assembly at the vehicle windshield; wherein the accessory comprises a camera; wherein, when the accessory is received at the accessory module assembly, the line of vision of the camera passes through an aperture existing in the accessory module assembly; wherein, with the accessory received at the accessory module assembly and with the accessory assembly attached by the fixing elements at the vehicle windshield, the line of vision of the camera passes through the vehicle windshield; and wherein the accessory module assembly further comprises a cover assembly detachably connectable to the frame assembly.