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For discussion on 14 April 1987
BACKGROUND
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CONFIDENTIALALE 172
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MEMORANDUM FOR EXECUTIVE COUNCIL
TATE'S CAIRN TUNNEL
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comme not leave MKD -tee also para 35. The continued rapid development of the North East New Territories has generated considerable additional traffic through Lion Rock Tunnel, the capacity of which is now reaching saturation. The need for an additional strategic road link between Sha Tin and East Kowloon was identified in the North East New Territories Study (NENTS) completed in 1982. The study suggested four possible alignments for a new road link between Sha Tin and North-east Kowloon as an alternative route to Lion Rock Tunnel. At the same time parallel investigations by the Highways Office indicated that a tunnel starting in the region of Diamond Hill quarry could be driven under Tate's Cairn to Sha Tin. The location of
The location of this tunnel as a traffic relief route to Lion Rock Tunnel was made more attractive by the decision to proceed with the Eastern Harbour Crossing and the proposed Kwun Tong By-pass.
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In April 1986, consultants were appointed to carry out an engineering feasibility study to establish the alignment of the tunnel and its connecting roads and to prepare preliminary designs. Two possible alignments were examined. Both had a common Kowloon portal position located in the Diamond Hill area, but at the Sha Tin end of the tunnel one route emerged at To Shek
Shek and the other at Siu Lek Yuen. Following further investigations, the study concluded that the preferred route was between Diamond Hill and Siu Lek Yuen with some 3.9 km in tunnel under Tate's Cairn, principally because it afforded greater scope for the traffic interchange
interchange to the trunk road layout in Sha Tin, in particular with the connecting roads to Ma On Shan and a proposed new bridge across the northern section of the Shing Mun River Channel. This route should also attract more traffic away from the Lion Rock Tunnel than one with a portal at To Shek. Plans showing the proposed layout of the tunnel are at Annexes Al, A2 and A3.
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The main proposals recommended in the Consultants' final report issued in December 1986 have been accepted by the Government Departments concerned
concerned as a satisfactory basis for detailed design. A copy of the Executive Summary of the Final Report is held in Councils Division should Members wish refer to it. The engagement of Consultants to carry out detailed design, including more extensive site investigations, was approved by the Finance Committee in February 1987 and this has already started.
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