Airstrip : A defined area symmetrically including the runway that is intended: (a) to reduce the risk of damage to aircraft running off a runway; and (b) to protect aircraft flying over it during take-off or landing operations
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}