At the investigation and preliminary design stage, we compared the impacts of different alignment options on reprovisioning of community facilities, environment, land and transport and made reference to comments collected during the public engagement process to select the present alignment. This alignment consists mainly of tunnel starting from Hoi Wang Road, running along Kansu Street, crossing Nathan Road and entering King’s Park, Ho Man Tin, Ma Tau Wai and Ma Tau Kok, crossing Kowloon Bay and surfacing again in KTD. The preferred alignment is 4.7km long and around 3.9km of its length will be a road tunnel. This alignment will not involve demolition of private developments and rehousing. It can also preserve the historic building of the Yau Ma Tei Police Station. However, temporary reclamation would be required to facilitate the construction of a 370m long underwater tunnel.
Yau Ma Tei Section
CKR will connect with the Yau Ma Tei Interchange of West Kowloon Highway in the west through 7 slip roads and through the interchange to West Kowloon Highway, Lin Cheung Road and Lai Cheung Road. Westbound traffic using CKR can get access through these slip roads to the Hong Kong Island in the south, Hong Kong International Airport and Kwai Tsing Container Terminal in the west and Northwest New Territories in the north. Vehicles can also get access to the West Kowloon Reclamation Development, the West Kowloon Terminus of the XRL and West Kowloon Cultural District through Lin Cheung Road.
The slip roads of CKR will be connected through a section of depressed road of about 200m in length to the section of cut-and-cover tunnel of about 400m in length crossing Ferry Street, running along Kansu Street and ending at Shanghai Street. The route along Kansu Street was chosen because it is the only route with wider width and will not involve resumption of any private properties.
In response to public concerns on the environmental impacts arising from the western tunnel portal, a landscape deck will be constructed above the western tunnel portal to cover a section of the CKR mainline as well as the section of Hoi Wang Road between Waterloo Road and Yan Cheung Road to minimize the environmental impacts of the tunnel portal. We have also moved the tunnel ventilation building from its original location near Ferry Street to the Yau Ma Tei Interchange at West Kowloon Highway to reduce the air quality impacts on nearby residents.
King's Park, Ho Man Tin and Ma Tau Wai Section
The second section of the CKR tunnel is 2.76 km long and starts from Shanghai Street going through Nathan Road, King’s Park, Ho Man Tin and Ma Tau Wai. The tunnel will be constructed in rock stratum about 30 to 140 m below ground level using drill-and-blast method. As there will be substantial separation between the tunnel and building foundations, the construction works will not affect the structural integrity of existing buildings. After the commissioning of CKR, there will be a reduction of around 10%-20% in the traffic flow along major trunk roads and help relieve the existing congested situation.
After Phase 2 Public Engagement, we have slightly revised the alignment of CKR at King’s Park Section after considering the public views collected from King’s Park residents. The revised alignment is shown in the figure below.
Ma Tau Kok and Kowloon Bay Section
On the eastern side of the drill-and-blast tunnel is a section of cut-and-cover tunnel of about 140m in length to be constructed at the Kowloon City Ferry Pier Public Transport Interchange.
The cut-and-cover tunnel will be connected to Kai Tak Development through an underwater tunnel of about 370m in length to be constructed in the seabed of Kowloon Bay. This route is chosen mainly because it will not involve any resumption/clearance of private properties. The tunnel will be constructed by temporary reclamation method. Temporary reclamation is the only safe and practical construction method given the various site constraints.
Kai Tak Section
The eastern end of CKR connects to Kai Tak Interchange and its slip roads leading to Kowloon Bay, Kwun Tong and Kai Tak Development, making it convenient to travel between these areas and West Kowloon. Vehicles can also make use of the road network in the Kai Tak Development to reach various destinations at the South Apron, North Apron and Runway of Kai Tak Development including the Cruise Terminal.