The Consultant has reviewed over 40 previous alignment options, including tunnel and flyover options.

Figure 1 - Tunnel Options

Figure 2 - Flyover Options

They covered most of Kowloon Peninsula, and included tunnel and flyover options as far north as Boundary Street and a flyover option across the harbour around the southern tip of Tsim Sha Tsui. The tunnel options are shown in Figure 1, and the flyover options are shown in Figure 2. Please click here for further details of the tunnel and flyover options.

The review found that the tunnel options across the central part of the peninsula scored the highest marks overall on consideration of environmental impacts, land impacts, traffic implications, and geometric design, and recommended to adopt tunnel options in the Central Kowloon corridor (in red portion).

Subsequently, taking into account views gathered during the Public Forums, as well as factors such as environmental, social and land-use impacts, traffic connectivity and engineering feasibility, 14 alignment options at Yau Ma Tei area were further developed out below for more in-depth consideration.

01: Side-by-side Tunnel along Kansu Street	02:Side-by-side Tunnel along Kansu Street	03:Side-by-side Tunnel along Kansu Street	04: Side-by-side Tunnel along Kansu Street
05: Double Deck Tunnel along Kansu Street	06: Side-by-side Tunnel Along Tung Kun Street	07: Elevated Flyover Along Waterloo Street	08: Split Tunnel along Kansu Street and Public Square Street
09: Split Tunnel along Public Square Street and Tung Kun Street	10: Split Tunnel along Kansu Street and Tung Kun Street	11: Deep Tunnel Option	12: Side-by-side Tunnel along Jordan Road
13: Side-by-side Tunnel along Waterloo Street	14: Side-by-side Tunnel along Saigon Street
1-14 Alignment Options

The general preferred features of an alignment option under traffic, engineering and impact assessments are that they should connect to West Kowloon Highway at the already constructed connecting points at the Yau Ma Tei Interchange, should be mainly in the form of a tunnel and affect private properties or public facilities as little as possible.

Options 4, 6, 11, 12, 13 and 14 are put forward as they totally avoid the community facilities namely the Yau Ma Tei Police Station, Yau Ma Tei Jockey Club PolyClinic and Specialist Extension. However, Options 4, 6, 12, 13 and 14 affect a number of private residential properties. Option 11 is a deep tunnel running under ground level facilities but it requires reclamation at the Yau Ma Tei Typhoon Shelter to construct connecting ramps. Option 12 cannot be directly connected to the Yau Ma Tei Interchange. Option 13 clashes with a large underground drain at Waterloo Road and is too close to the Yau Ma Tei MTR underground station.

Options 8, 9 and 10 adopt split tunnel format where the tunnel tube for one direction runs along a route some distance away from the other tube. This arrangement reduces the width of the site for Construction locally but two such sites will be required. Upon further examination, Tung Kun Street and Public Square Street are not wide enough to accommodate a tunnel tube without affecting Prosperous Garden. As such these options are either not feasible or carry high risks.

Options 1, 2, 3, 5 and 7 (re - designated Alignment Options A to E and presented in detail in the following five diagrams) are considered the more feasible options as they have manageable impacts in terms of community facilities affected, resumption of private properties, traffic disruption and proximity to sensitive receivers.

In-depth evaluation of these five initial alignment options were then carried out on the engineering feasibility and associated impacts to arrive at a preferred alignment scheme. We have consulted the respective District Councils and the Legislative Council Panel on Transport and continue to consult the public throughout the course of the investigation, design and construction of the CKR. Please feel free to let us know your comments.

Alignment Option A Alignment avoids Kansu Street	Alignment Option B Alignment avoids old and new wings of police station
Alignment Option C Alignment avoids old wings of police station	Alignment Option D Double deck tunnel
Alignment Option E Flyover scheme along Waterloo Road

Cut and cover tunnel         Bored tunnel         Underwater tunnel

Typical cross-section of cut-and-cover tunnel
(Not to Scale)

In view of topography and geology of Ho Man Tin and Ma Tau Wai areas, the central section of CKR comprises mainly of deep bored tunnel. The proposed bored tunnel of about 2.7 km long would run in underlying rock strata below ground to avoid affecting the buildings, roads and services at ground level.

Typical cross-section of bored tunnel

The east end of CKR will connect to future Trunk Road T2, Kai Fuk Road, Kai Cheung Road and the road network of the proposed Kai Tak Development. The section of CKR between Kowloon City Ferry Pier and Kai Tak Runway will be an underwater tunnel underneath the seabed in Kowloon Bay.

Typical cross section of underwater tunnel
(Not to Scale)

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Central Kowloon Route is a designated project under the Environmental Impact Assessment Ordinance. Further assessment on the provision of the above mitigation measures will be carried out during the Environmental Impact Assessment. In addition, according to the statutory requirement, we will consider the environmental impacts and the necessary mitigation measures required during construction and after completion of the project.

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