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3. Tunnel safety testing (TST) Web-site http://www.tunneltest.com/ingles/tunelensayo.php . Accessed 13 July 2012
4. Implementation of vehicle immobiliser system in Phase 2 of the Hazmat Transport Vehicle Tracking System, Singapore Civil Defence Force, Jan 2007
5. Singapore Gazette, Road Traffic Act 2006, Chapter 276, Sections 114 and 140, Road Traffic Expressway Traffic Rules, June 2006