Traffic Control Signal 2 : Any device whether manually, electrically, or mechanically operated by which traffic is alternately directed to stop or permitted to proceed
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}