| 1.5.2.2. | The test may be carried out on a level road, the trailer being drawn by a towing vehicle; during the test, the force applied to the control shall be adjusted so as to keep the resistance of the trailer constant (7 per cent of the maximum total stationary axle load of the trailer). If the power available for hauling is insufficient, the test can be conducted at a lower speed but over a greater distance as shown in the table below: | a0c0 |