Document ID: chunk:federal_register_of_legislation:F2023C00919:body:0:p22
Version: federal_register_of_legislation:F2023C00919
Segment Type: other
Provision Reference: 
Character Range: 71889–75129

and protecting such seals.
2.14.6.                          Of service-door lighting systems on vehicles of categories M2 and M3 as specified in paragraph 2.7.
2.15.                                "Overall dimensions" means the distance between the two vertical planes defined in paragraph 2.14. above.
2.15.1.                          "Overall width" means the distance between the two vertical planes defined in paragraph 2.14. above.
2.15.2.                          "Overall length" means the distance between the two vertical planes perpendicular to the median longitudinal plane of the vehicle and touching its front and rear outer edge, disregarding the projection:
(a) Of devices for indirect vision;
(b) Of end-outline marker lamps;
(c) Of coupling devices, in the case of motor vehicles.
 For trailers in the "overall length" and in any measurement in length the drawbar shall be included, except when specifically excluded.
2.16.                                "Single and multiple lamps"
2.16.1.                          "A single lamp" means:
             (a) A device or part of a device having one lighting or light-signalling function, one or more light source(s) and one apparent surface in the direction of the reference axis, which may be a continuous surface or composed of two or more distinct parts; or
             (b) Any assembly of two lamps marked "D", whether identical or not, having the same function; or
             (c) Any assembly of two independent retro-reflectors, whether identical or not, that have been approved separately; or
             (d) Any interdependent lamp system composed of two or three interdependent lamps marked "Y" approved together and providing the same function.
2.16.2.                          "Two lamps" or "an even number of lamps" in the shape of a band or strip, means two lamps with a single light emitting surface, providing such a band or strip is placed symmetrically in relation to the median longitudinal plane of the vehicle.
2.17.                                "Distance between two lamps" which face in the same direction means the shortest distance between the two apparent surfaces in the direction of the reference axis. Where the distance between the lamps clearly meets the requirements of the Regulation, the exact edges of apparent surfaces need not be determined.
2.18.                                "Operating tell tale" means a visual or auditory signal (or any equivalent signal) indicating that a device has been switched on and is operating correctly or not.
2.19.                                "Closed circuit tell tale" means a visual (or any equivalent signal) indicating that a device has been switched on, but not indicating whether it is operating correctly or not.
2.20.                                "Optional lamp" means a lamp, the installation of which is left to the discretion of the manufacturer.
2.21.                                "Ground" means the surface on which the vehicle stands which should be substantially horizontal.
2.22.                                "Movable components" of the vehicle mean those body panels or other vehicle parts the position(s) of which can be changed by tilting, rotating or sliding without the