Axle Load 2 : The total load transmitted by all wheels the centers of which may be included between two parallel transverse vertical planes 40 inches apart, extending across the full width of the vehicle
Ilan Kelman (ed.), Vulnerability and Resilience Definitions and References, Version 2, 2007. http://www.islandvulnerability.org/docs/vulnres.pd f, (Vulnr and Resilience - Brit) {524}