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    Regulation No 34 of the Economic Commission for Europe of the United Nations ... (42008X0723(01))
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    EU - Rechtsakte: 11 External relations
    3.1.   Equivalent test methods are permitted provided that the conditions referred to in this Regulation can be observed either entirely by means of the substitute test or by calculation from the results of the substitute test.
    3.2.   If a method other than that described in paragraph 2. above is used its equivalence must be demonstrated.

    ANNEX IV

    Procedure for rear-end collision test

    1.   PURPOSE AND SCOPE

    1.1.
    The purpose of the test is to simulate the conditions of rear-end collision by another vehicle in motion.

    2.   INSTALLATIONS, PROCEDURES AND MEASURES INSTRUMENTS

    2.1.   Testing ground

    The test area shall be large enough to accommodate the impactor (striker) propulsion system and to permit after-collision displacement of the vehicle struck and installation of the test equipment. The part in which vehicle collision and displacement occur shall be horizontal, flat and smooth and have a coefficient of friction of not less than 0.5.

    2.2.   Impactor (striker)

    2.2.1.
    The impactor shall be of steel and of rigid construction.
    2.2.2.
    The impacting surface shall be flat, not less than 2 500 mm wide, and 800 mm high, and its edges shall be rounded to a radius of curvature of between 40 and 50 mm. It shall be clad with a layer of plywood 20 mm thick.
    2.2.3.
    At the moment of collision the following requirements shall be met:
    2.2.3.1.
    the impacting surface shall be vertical and perpendicular to the median longitudinal plane of the vehicle struck;
    2.2.3.2.
    the direction of movement of the impactor shall be substantially horizontal and parallel to the median longitudinal plane of the vehicle struck;
    2.2.3.3.
    the maximum lateral deviation tolerated between the median vertical line of the surface of the impactor and the median longitudinal plane of the vehicle struck shall be 300 mm. In addition, the impacting surface shall extend over the entire width of the vehicle struck;
    2.2.3.4.
    the ground clearance of the lower edge of the impacting surface shall be 175 ± 25 mm.

    2.3.   Propulsion of the impactor

    The impactor may either be secured to a carriage (moving barrier) or form part of a pendulum.

    2.4.   Special provisions applicable where a moving barrier is used

    2.4.1.
    If the impactor is secured to a carriage (moving barrier) by a restraining element, the latter must be rigid and be incapable of being deformed by the collision; the carriage shall at the moment of collision be capable of moving freely and no longer be subject to the action of the propelling device.
    2.4.2.
    The velocity of collision shall be between 35 and 38 km/h.
    2.4.3.
    The aggregate weight (mass) of carriage and impactor shall be 1 100 ± 20 kg.

    2.5.   Special provisions applicable where a pendulum is used

    2.5.1.
    The distance between the centre of the impacting face and the axis of rotation of the pendulum shall be not less than 5 m.
    2.5.2.
    The impactor shall be freely suspended by rigid arms rigidly secured to it. The pendulum so constituted shall be substantially incapable of being deformed by the collision.
    2.5.3.
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