Specifies minimum performance criteria and the test requirements for protective headgear for vehicle users, designed to mitigate the adverse effects of a blow on the head. It refers particularly to helmets for motor cyclists, but is equally applicable to all vehicle users, including racing car drivers and racing motor cyclists. Tests for impact attenuation, penetration resistance, strength of the retention system and its attachments, and peripheral vision are prescribed. Specific marking requirements are detailed. Identical to AS 1698-1988 with modifications for New Zealand.