Document ID: chunk:federal_register_of_legislation:F2023C00919:body:0:p75
Version: federal_register_of_legislation:F2023C00919
Segment Type: other
Provision Reference: 
Character Range: 222117–225139

tractors for semi-trailers, if fitted, the length of the cab; however, when using the alternative marking mode per paragraph 6.21.4.2.1.1., the distance beginning within 2,400 mm from the front end of vehicle to its rear end.
         A is the distance between the foremost conspicuity marking and the front end of the vehicle. The maximum value of A is 2,400 mm (see paragraph 6.21.4.2.1.1.).
         6.21.4.2.2.2.              For trailers, the overall length of the vehicle (excluding the drawbar).
6.21.4.3.                    Height
6.21.4.3.1.              Line markings and contour markings lower element(s)
As low as practicable within the range:
Minimum: not less than 250 mm above the ground.
Maximum: not more than 1,500 mm above the ground.
However, a maximum mounting height of 2,500 mm may be accepted where the shape, structure, design or operational conditions of the vehicle prevent compliance with the maximum value of 1,500 mm or, if necessary, to fulfil the requirements of paragraphs 6.21.4.1.2., and 6.21.4.2.2., or the horizontal positioning of the line marking or the lower element(s) of the contour marking.
The necessary justification for installation of conspicuity material higher than 1,500 mm shall be indicated in the communication form.
6.21.4.3.2.              Contour markings upper element(s):
As high as practicable, but within 400 mm of the upper extremity of the vehicle.
6.21.5.                          Visibility
The conspicuity marking shall be considered visible, if at least 70 per cent of the illuminating surface of the installed marking is visible when viewed by an observer positioned at any point within the observation planes defined below:
6.21.5.1.                    For rear and front conspicuity markings (see Annex 11, Figures 1a and 1b) the observation plane is perpendicular to the longitudinal axis of the vehicle situated 25 m from the extreme end of the vehicle and bounded by:
6.21.5.1.1.              In height, by two horizontal planes 1 m and 3.0 m respectively above the ground;
6.21.5.1.2.              In width, by two vertical planes which form an angle of 4° outwards from the vehicle's median longitudinal plane and which pass through the intersection of the vertical planes parallel to the vehicle's median longitudinal plane delimiting the vehicle's overall width, and the plane perpendicular to the longitudinal axis of the vehicle that delimits the end of the vehicle.
6.21.5.2.                    For side conspicuity markings (see Annex 11, Fig. 2) the observation plane is parallel to the longitudinal median plane of the vehicles situated 25 m from the extreme outer edge of the vehicle and bounded by:
6.21.5.2.1.              In height, by two horizontal planes 1.0 m and 1.5 m respectively above the ground;
6.21.5.2.2.              In width, by two vertical planes which form an angle of 4° outwards from a plane perpendicular to the vehicle's longitudinal axis and which pass through the intersection of the vertical planes perpendicular