Test site. Any area not subject to major acoustic perturbations may be used as a test site. Level areas covered with concrete, asphalt or some other hard material and are highly reflective are suitable; surfaces consisting of earth which has been tamped down shall not be used. The test site shall have at least the dimensions of a rectangle the sides of which shall be 3 m from the outline of the vehicle (excluding handlebars). No significant obstacle such as a person other than the observer and the driver shall be within this rectangle. The vehicle shall be placed within the above-mentioned rectangle in such a way that the measuring microphone is at least one metre from any stone edging.
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Test site. Any area not subject to major acoustic perturbations may be used as a test site. Level areas covered with concrete, asphalt or some other hard material and are highly reflective are suitable; surfaces consisting of earth which has been tamped down shall not be used. The test site shall have at least the dimensions of a rectangle the sides of which shall be 3 m from the outline of the vehicle (excluding handlebars). No significant obstacle such as a person other than the observer and the driver shall be within this rectangle. The vehicle shall be placed within the above-mentioned above‑mentioned rectangle in such a way that the measuring microphone is at least one metre from any stone edging.
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Samples: unece.org
