Active Vehicles in Fleet : The vehicles in the year-end fleet that are available to operate in revenue service, including spares and vehicles temporarily out of service for routine maintenance and minor repairs
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}