Traffic Pattern Indicators : Markers associated with the segmented circle system for the purpose of controlling the direction of the traffic pattern when there is any variation from the normal left hand pattern
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}