4. Alignment-—
When a vehicle is at its kerbside weight and has a weight of 75 kg on the driver’s seat, and any manual headlamp levelling device control is set to the stop position, the alignment of every dipped-beam headlamp shall, as near as practicable, be set so that it is permanently deflected downwards to such an extent that it is at all times incapable of dazzling any person at a greater distance than 9 m from the lamp whose eye-level is not less than 1300 mm above that plane.