However, for front central seating positions, lap-belts, whether or not fitted with retractors, shall be considered adequate where the windscreen is located outside the reference zone defined in Annex II to Directive 74/60/EEC ...
1. The head-impact zone shall comprise all the non-glazed surfaces of the interior of a vehicle which are capable of entering into static contact with a spherical head 165 mm in diameter which is an integral part of a measuring apparatus whose dimensions from the pivotal point of the hip to the top of the head is continuously adjustable between 736 mm and 840 mm.
2. The aforesaid zone must be determined by the following procedure or its graphic equivalent:
2.1. The pivotal point of the measuring apparatus shall be placed as follows for each seating position for which the manufacturer has made provision:
2.1.1. in the case of sliding seats
2.1.1.1. at the H point (see Annex IV) and
2.1.1.2. at a point situated horizontally 127 mm forward of the H point and at a height either resulting from the variation in the height of the H point caused by a forward shift of 127 mm or of 19 mm.
