A system whereby specific vehicles, such as buses, are given preference at traffic signals in order to speed their movement. Preemption is one type of preferential treatment
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}