All sheets must be accounted for and either closed off or re-scheduled before the new 'work to' list is formed. The maintenance superintendent checks all sheets to ensure quality of the system. Defects are entered into the system by the operations personnel who monitor the operation of all equipment or are usually the first point of contact for other personnel. The technician who rectifies a defect is responsible for issuing and completing the defect job sheet. Checks are made to ensure the same information on the job sheet is entered into the computer. Finally, regular reviews of the planned maintenance task are conducted to ensure their relevance (Allen 2003).

4. In addition, the Tunnel has thermal point detectors spaced every 15 metres over each lane; more than 40 CCTV cameras - an additional 48 cameras were installed in 2000 - facing oncoming traffic throughout both tubes; complimented by a manual...
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