2.1.1.1
The location plan of the
Revised Austin Road Flyover is shown in Figure
1.1. The Project site is
situated within part of the WKCD area and across the toll plaza of the Western Harbour Crossing (WHC). The western boundaries of the study area
are at the side of the WKCD Waterfront Promenade to the west of the WHC toll
plaza, while the eastern boundaries of the study area are at the side of the
Austin Road West / Nga Cheung Road roundabout.
2.1.1.2
With reference to the approved
WKCD Development Plan No. S/K20/WKCD/2 and South West Kowloon Outline Zoning Plan
No. S/K20/30, the lands in the vicinity of WKCD are mainly ¡§Comprehensive
Development Area¡¨, ¡§Open Space¡¨, ¡§Residential (Group A)¡¨, ¡§Government, Institution
or Community¡¨ and ¡§Other Specified Uses¡¨. According to the covering
Notes of the Development Plan and the Outline Zoning Plan, road works
coordinated or implemented by Government and/or West Kowloon Cultural District
Authority are always permitted on land falling within the boundaries of the
Plans except where the uses or developments are specified in Column 2 of the
Notes of the individual zones. A layout
plan showing the land uses is illustrated in Figure
2.1.
2.2.1.1
The scope of the Revised Austin
Road Flyover is to construct and operate a mainly 2-lane
flyover of about 400m connecting the western end of the elevated Austin Road
West with the WKCD at the western side of the WHC toll plaza area and mainly
comprises:
(i)
Construction of a mainly 2-lane
flyover of about 400m long across WHC toll plaza area;
(ii) Construction of a single 2-lane ramp of about 250m long from the
western end of the Revised Austin Road Flyover to the WKCD;
(iii) Construction of a single-lane ramp of about 300m long from the
western end of the Revised Austin Road Flyover towards the northbound service
road of WHC; and
(iv) Modification of at-grade roads within the interface of WKCD road
network to connect with the ramp stated in (ii).
Revision of scope of works
of the Project was confirmed with EPD in accordance with Section 6.2 of EIA
Study Brief and the confirmation letter is presented in Appendix 4.1.
2.3
Purpose,
Objective and Benefits of the Project
2.3.1.2
The flyover spanning over the
WHC toll plaza connecting to the elevated junction of Nga Cheung Road / Austin
Road West will be put forward to provide a second access for the Mega
Performance Venue (MPV) and Exhibition Centre (EC) located in Zone 4 of the
WKCD. Under normal conditions, the
flyover will be used by general traffic.
The flyover also provides flexibility for event management as a route of
¡§very important persons (VIPs)¡¨, performers to the MPV / EC and to enhance the
accessibility and robustness of the operational arrangements including post
event dispersal. The flyover can
also be used as a second emergency route to supplement the at-grade Museum
Drive.
2.3.1.3
With the introduction of a
single ramp connecting to the Museum Drive at the WKCD, it will help to
disperse traffic away from the busy elevated junction of Jordan Road / Nga
Cheung Road and also provide a short cut between the Kowloon Station Topside
Developments and the West Kowloon Highway.
2.4.1.1
In 2009, Transport Department
(TD) completed a West Kowloon Reclamation Development Traffic Study identifying
road improvement schemes to meet the long-term traffic demand of the West
Kowloon Reclamation Area taking into account the developments in the Area
including WKCD, West Kowloon Terminus of the Guangzhou-Shenzhen-Hong Kong
Express Rail Link (XRL) and its top-side property developments, and the
developments above Austin Station (AUS). The recommended schemes would be (i) Access Ramp; (ii) Permanent Improvement Works to the
junctions at Jordan Road/Nga Cheung Road (elevated) (J8); and (iii) Permanent
Improvement Works to Lin Cheung Road/Jordan Road (J11) for 2031 under the WKCD
Development Plan.
2.4.1.2
West Kowloon Cultural District
Authority (WKCDA) commissioned at the end of 2016 a traffic review (the
Authority¡¦s traffic review) based on the updated land usage of P46 and P47 of
the WKCD for the Exhibition Hub Development Area (EHDA) planned for 2022 (the
assumed year of completion when the 2016 study was carried out). The Authority¡¦s traffic review identified
that the junction at Lin Cheung Road/Jordan Road would be at full capacity in
2025 with the increasing number of traffic from the WKCD. From junction capacity point of view, the
Authority¡¦s traffic review identified that combinations of (a) Access Ramp
and/or (b) New Exit Road and/or (c) WHC Flyover would provide some feasible
traffic improvement schemes required in 2025 to alleviate the anticipated
network capacity problems.
2.4.1.3
Further review on identifying
the preferred traffic improvement scheme for the WKCD development has been
conducted under this Project.
2.4.1.4
Section 2.5 and Section 2.6
below present the scenario without the Project, and other options considered
for the Project. Section 2.7 compares the different options and summarizes the reasons for selecting the revised Austin Road Flyover
and new exit road as the selected option.
Section 2.8 presents the Fine-tuned Enhanced New Exit Road (NER) Arrangement
which is further developed based on the selected option.
2.5.1.2
For both existing road users of
the WKCD and the Kowloon Station Topside Developments, they will have to go
ahead to the Jordan Road/Nga Cheung Road Roundabout and continue towards the
junction at Lin Cheung Road/Jordan Road for joining with the West Kowloon
Highway.
2.5.1.3
The Original Austin Road
Flyover Scenario will worsen the traffic condition of these major junctions,
which are already congested, upon the intake of WKCD development. The junction capacity at Jordan Road/Lin
Cheung Road would be insufficient (Reserve Capacity <0%).
2.6.1.1
In addition to the Original
Austin Road Flyover Scenario, 3 different options to connect the WKCD
development to adjacent roads have been explored based on combinations of the
previous improvement schemes in the Authority¡¦s traffic review. These options are listed below:
¡P
Option 1 ¡V At-grade Exit Road
¡P
Option 2 ¡V At-Grade Exit Road
and WHC Flyover
¡P
Option 3 ¡V Enhanced WHC Flyover
Option 1: At-Grade
Exit Road
2.6.1.2
This Option consists of the
at-grade Exit Road connecting the at-grade roads of WKCD and the northbound
service road of the WHC portal.
Traffic taking this at-grade roadway can continue towards the Jordan
Road Flyover by staying on the nearside.
2.6.1.3
Apart from widening of the
northbound service road of the WHC portal from 1 lane to 2 lanes width, no
major modifications to the existing road infrastructure is expected under this
Option. To facilitate the widening
of the service road, a strip of land from the Yau Ma Tei Public Cargo Working Area (PCWA) and a small portion of
the possible pigging station for Towngas will be
taken up permanently.
2.6.1.4
The schematic road alignment
for Option 1 is illustrated in Figure
2.3.
Option 2: At-Grade
Exit Road and WHC Flyover
2.6.1.5
Option 2 consists of the
at-grade Exit road as mentioned in Option 1 and a flyover across the Western Harbour Crossing (WHC). This option preserves the essence
of the improvement to the road connectivity by providing a direct connection
towards Jordan Road Flyover, as well as the Flyover across the WHC portal.
2.6.1.6
Since the at-grade exit road
and the western ramp of the WHC Flyover will be running in parallel, additional
land is expected to be consumed by the parallel road section which will in turn
narrows the available promenade spaces.
2.6.1.7
The schematic road alignment
for Option 2 is illustrated in Figure
2.4.
Option 3: Enhanced
WHC Flyover
2.6.1.8
From the review of previous
alignment designs, it is noted that substantial spaces will be taken up by the
parallel running at-grade Exit Road and the western ramp of WHC Flyover. Traffic along these parallel routes are
in principally heading towards the same direction and combination of these two
routes have therefore been studied.
A pair of ramps, each locating at the north and south sides at the
western end of the WHC Flyover, are proposed to be provided to substitute the
parallel running at-grade road and ramp.
2.6.1.9
The schematic road alignment
for Option 3 is illustrated in Figure
2.5.
2.7.1.1
The
comparison of ¡§Traffic Requirements¡¨, ¡§Constructability¡¨, ¡§Land and Statutory
Feasibility¡¨ and ¡§Environmental Considerations¡¨ between different options are
shown in Table
2.1 to Table
2.3 below, respectively.
Table 2.1 Summary
of Comparison under Traffic Requirement
Option Description
|
Traffic
Requirements
|
Capacity of Adjacent
Road Network
|
Design and Geometry
|
Accessibility of
Vehicles
|
Accessibility
of Pedestrians
|
Option 1
At- grade Exit Road
|
No improvement / benefit to stakeholders of Kowloon Station
topside development
|
No impact to the operation of WHC
|
Only departure traffic from the WKCD is benefited
|
Vehicular/ pedestrian conflict with the at-grade Exit Road
|
|
|
ü
|
|
|
Option 2
At-grade Exit Road and WHC Flyover
|
No improvement / benefit to stakeholders of Kowloon Station
topside development
|
No impact to the Loop Road near Nga Cheung Road
|
Traffic diverted from at ¡Vgrade Nga Cheung Road and Lin Cheung
Road to the more direct Exit Road
|
Vehicular/ pedestrian conflict with the at-grade Exit Road
|
|
|
ü
|
|
|
Option 3
Enhanced WHC Flyover
|
Improvement / benefit to stakeholders of Kowloon Station topside
development
|
No impact to the Loop Road near Nga Cheung Road
|
Reliefs capacity problems of elevated Nga
Cheung Road by attracting Kowloon Station Topside Development traffic to the
new northbound ramp
|
No vehicular / pedestrian conflict at the
west side as the northbound road is elevated
|
|
ü
|
ü
|
ü
|
ü
|
Remarks:
ü indicates the Option(s)
which will be preferable in the particular aspect over
the other Option(s).
Table 2.2 Summary
of Comparison under Constructability, and Land and Statutory Feasibility
Option Description
|
Constructability
|
Land and Statutory Feasibility
|
Constructability and
Operation of Adjacent Facilities
|
Geotechnical Impact
|
Impact on adjacent land
lots or Outline Zoning Plan (OZP)
|
Option 1
At- grade Exit Road
|
¡P
Less
superstructure involved
|
¡P
Less
work involved
|
¡P
Affecting
the potential pigging station and the NYMTPCWA
|
|
ü
|
ü
|
|
Option 2
At-grade Exit Road and WHC Flyover
|
¡P
Obstruction
of existing WHC advertising boards on toll plaza footbridge and exact payment
signs & flood lights on WHC toll booth canopy
¡P
Additional
working space required for the construction of at0grade road and ramp
|
¡P
Additional
foundation works and modification of the existing pile caps are required to
suit the new flyover arrangement
|
¡P
Affecting
WHC Toll Plaza
¡P
Affecting
the potential pigging station and the NYMTPCWA
|
Option 3
Enhanced WHC Flyover
|
¡P
Obstruction
of existing WHC advertising boards on toll plaza footbridge and exact payment
signs & flood lights on WHC toll booth canopy
|
¡P
Bedrock
levels are expected to be deeper at the northern areas of the exit ramp
|
¡P
Affecting
WHC Toll Plaza
¡P
Affecting
the potential pigging station and the NYMTPCWA
|
Remarks:
ü indicates the Option(s)
which will be preferable in the particular aspect over
the other Option(s).
Table 2.3 Summary
of Environmental Considerations
Option Description
|
Environmental Considerations
|
Environmental Benefits
|
Environmental
Disbenefits
|
Option 1
At- grade Exit Road
|
¡P
Traffic
normally using Lin Cheung Road and Nga Cheung Road will be diverted to use
the new exit road
|
¡P
Traffic
volume increase along new exit road
|
|
|
ü
|
Option 2
At-grade Exit Road and WHC Flyover
|
¡P
Traffic
normally using Lin Cheung Road and Nga Cheung Road will be diverted to use
the new exit road
|
¡P
Increase
in traffic along elevated Nga Cheung Road (between Jordan Road and Austin
Road West)
¡P
Traffic
volume increase along new exit road
|
Option 3
Enhanced WHC Flyover
|
¡P
Traffic
normally using Lin Cheung Road and Nga Cheung Road will be diverted to use
the new exit road
¡P
Divert
Kowloon Station topside development traffic from elevated Nga Cheung Road to
new exit road
|
¡P
Traffic
volume increase along new exit road
|
|
ü
|
ü
|
Remarks:
ü indicates the Option(s)
which will be preferable in the particular aspect over
the other Option(s).
2.7.1.2
Taking into account of the
considerations described in Table
2.1 to Table
2.3, Option 3 is considered preferable. In addition, Option 3 would offer better
connectivity to the NER road network.
With the availability of the right turning movement at the westbound
lane of the WHC Flyover in Option 3, the proposed roads would allow motorists
from the elevated Nga Cheung Road to conveniently access Lin Cheung Road via
the northbound down ramp of New Exit Road.
This newly introduced turning movement will not only provide a short cut
for users of the Kowloon Station Topside Developments, but also help to
disperse traffic away from the busy elevated junction of Jordan Road / Nga
Cheung Road. In case of road
accident / blockage of the northern section of elevated Nga Cheung Road, the
right turn of the WHC Flyover may also serve as an alternative access for users
of the Kowloon Station Topside Developments.
2.7.1.4
With reference to Table
2.3, the air
quality impact and traffic noise impact on the air and noise sensitive
receivers at the Cullinan, Sorrento, The HabourSide,
The Arch, The Waterfront, International Commerce Centre and developments at
WKCD (e.g. M+, Hong Kong Palace Museum, etc.) will be alleviated under all the
above 3 options as the traffic would be distributed towards the proposed
NER. In
particular, Option 3 will further divert the Kowloon Station topside
development traffic from the elevated Nga Cheung Road to the NER.
2.7.1.5
For Option
2, it is expected that there will be increase in traffic along elevated Nga
Cheung Road (between Jordan Road and Austin Road West). Thus, the environmental disbenefits
brought by Option 2 will be more than the other 2 options.
2.8.1.1
Further to the options
identification and evaluation as described in Section 2.6 and 2.7 above, the Consultant has continued to explore the measures to
optimize NER alignment based on the selected Option 3 with the aim to reduce
the impact on the land within PCWA. Further to the meetings with Marine
Department (MD) on 11 April, 17 May and 25 June 2019, and the meeting with MD and
the Public Cargo Working Area (PCWA) operators on 17 September 2019, the
Consultant understood that part of the NER which will encroach into the PCWA
will cause adverse impact to the daily operation of the PCWA operators
permanently or temporarily.
2.8.1.2
Under the Fine-tuned Enhanced
NER Arrangement (Option 4), the NER will no longer encroach into the PCWA. Instead, the NER down ramp will be
aligned atop the existing WHC Slip Road towards the Hoi Po Road direction. Traffic using the WHC slip road will be
diverted onto the existing toll plaza area and connected back towards the Hoi
Po Road direction.
2.8.1.3
Meeting with TD (TD Region
Office and Tunnel Office) was held on 15 November 2019 to discuss the details
of this proposed fine-tuned NER alignment, the potential impact to WHC and
other details such as the forecasted change in traffic flow between the
abovementioned Option 3 and Option 4.
2.8.1.4
Regarding the potential impact
of the NER to the WHC operation, TD suggested AECOM to approach WHTCL to
understand their operation needs. As
such, meetings with Western Harbour Tunnel Co. Ltd. (WHTCL)
has been held on 11 December 2019 to discuss the potential impact to WHC area. It is noted after the meeting that WHTCL
will have no in-principal objection on the abovementioned Option 4 given that
the construction will commence after the expiry of their franchise period on 1
August 2023.
2.8.1.5
Another meeting with TD was
held on 23 December 2019 to discuss whether this fine-tuned NER alignment shall
be adopted as the final version. TD
advised that they have no in-principal objection on the fine-tuned NER
alignment and Option 4 will be adopted over Option 3 in this and the
forthcoming Phases, i.e. Design Development Phase, Detailed Design Phase,
Tender Phase and Construction Phase.
2.8.1.6
The schematic road alignment and
the vertical alignment of the proposed Project (Option 4) are illustrated in Figure 2.6 and Figure 2.7.
2.8.1.7
During the
course of the design development based on the
Fine-tuned Enhanced NER Arrangement, the Consultant of WKCDA has been
continuously exploring the possibility to minimize the potential amount of
waste generation. For instance, a Site Investigation Contract was tendered out
in mid 2020 to conduct ground investigation to obtain
necessary geotechnical data of within the Project Boundary. The Consultant of
WKCDA can then make use of the available geotechnical data to carry out the
most optimistic design, for example, layout of the NER with the least number of
foundation, i.e. number of piles, pile caps etc., such that the extent of
excavation required (C&D material generated) will be reduced accordingly.
2.8.1.8
Apart from the impact in terms
of land use, this Fined-tuned Enhanced NER Arrangement was also developed with
the aim to reduce the landscape and visual impact. Considering that the New Yau Ma Tei Typhoon Shelter is one
of the Landscape Character Areas and the Occupants in PCWA as one of the
visually sensitive receivers, the impact from a landscape and visual impact
point of view will be reduced when the NER will no longer encroach into the
PCWA.
2.9.1.1
Without the Project, numbers of
junctions he WKCD will be overloaded upon the full completion of WKCD
development in 2031. The Project
will provide an additional route from the WKCD to adjacent road network. Without which, the existing road network
will not be sufficient to cope with the forecast
traffic demand.
2.9.1.2
To the users of Kowloon Station
Topside Developments, the direct impact of the Project not proceeding ahead
will be the deprivation of the most convenient access to Lin Cheung Road via
the proposed flyover.
2.10
Consideration
of Alternative Construction Methods
2.10.1.1
For the selected Option 4, the
proposed revised Austin Road Flyover can be erected by cast in-place concrete
construction method, prefabricated steel structure construction method or
precast concrete construction method.
Having considered the scale and site condition of the proposed bridge,
it is a more effective and environmentally friendly approach to adopt precast
concrete construction method.
2.10.1.2
Comparison of the merits and
demerits between these three construction methods is shown in Table
2.4
below.
Table 2.4 Comparison
of Construction Methods
Construction Methods
|
Cast-In place Concrete
|
Prefabricated Steel Structure
|
Precast Concrete
|
Merits
|
¡P
Conventional construction method and require relatively
less special skilled when comparing with other construction methods
considered.
¡P
Durable and less maintenance cost.
|
¡P
Conduct prefabrication works in fabrication yard away from
the site.
¡P
Better control of quality and workmanship for works in
fabrication yard.
¡P
Fabricate the whole bridge deck structure by steel plates/
members and no formworks.
¡P
More efficient construction works as the deck structure can
be fabricated off-site concurrently with the substructure works (i.e. allow
time overlap of construction activities).
¡P
Shorten construction time relatively, bridge deck
construction can be non-linear (multiple work fronts), with minimising
on-site potential environmental impacts.
¡P
Requires less temporary steel platforms, relatively, for
construction of light weight steel structure, thus resulting in smaller area
of temporary habitat loss.
|
¡P
Conduct precasting works in fabrication yard away from the site.
¡P
Better
control of quality and workmanship for works in fabrication yard.
¡P
Use
steel mould as formworks to maximise the reuse of formwork, which is more
environmental-friendly.
¡P
More
efficient construction works as the deck segments can be casted off-site
concurrently with substructure works (i.e. allow time overlap of construction
activities).
¡P
Shorten
construction time, bridge deck construction can be non-linear (multiple work
fronts), with minimizing on-site potential environmental impacts.
¡P
Durable
and less maintenance cost.
¡P
Relatively
requires less temporary steel platform for construction of precast structure,
thus resulting in smaller area of temporary habitat loss.
|
Demerits
|
¡P
Prepare
concrete mix at a central batching plant, where controls of the materials
should be monitored much carefully.
¡P
For
transporting concrete to the site, proper mixing in truck, discharging from
the truck and depositing in the forms, and handling for placement, finishing
and curing are all subject to the level of responsibility and craft exercised
by the workers involved.
¡P
Site
conditions in terms of accessibility and weather can be highly critical to
the work, requirement of extreme measures in some situations to control all
stages in the production process. Possibility of site run-off might be higher
under bad weather conditions.
¡P
Use
timber formwork, which is less environmentally friendly.
¡P
Longer
construction time ¡V carry out bridge deck construction only (1) after
substructure works is completed and (2) after completion of previous span for
cast in-place span by span.
¡P
Require
substantial temporary steel platform / falsework for construction of the
marine bridge deck section.
|
¡P
Subject to high risk of steel corrosion, while the
application of anti-corrosion paint might lead to the deterioration of water
quality.
¡P
High maintenance cost.
¡P
Less durable.
¡P
Require another trade of skilled workers and additional
construction equipment for erecting steelwork structures.
|
¡P
Require
another trade of skilled workers and additional construction equipment for
erecting precast segments.
|
2.10.1.3
Based on the considerations
above, precast concrete construction method is considered to
be the preferred construction method and therefore adopted in the
Project as far as possible. The other
two construction methods would be considered only when precast construction
method is not feasible. The precast
concrete will be cast in Mainland China.
There would be no off-site works area including site office for
construction works within Hong Kong.
¡P
Phase 1: Construction of NER
(within WKCD Area)
¡P
Phase 2: Construction of NER
(within WHC Area) and Construction of WHC Flyover (within WHC Area)
2.11.1.3
The Project will be in
operation after all construction works are completed, i.e. after September
2025, and no phased operation is planned.
2.12.1.1
Based on currently available
information, concurrent projects within the Study Area have been identified as
follows. Cumulative impacts from
the concurrent projects have been assessed in the individual sections of this
EIA Report.
¡P
Integrated Basement for West
Kowloon Cultural District ¡V Zone 2BC (construction period from 2022 to 2027)
¡P
Integrated Basement for West
Kowloon Cultural District ¡V Zone 3B (construction period from 2017 to 2023)
¡P
Exhibition Centre in Zone 4 of
West Kowloon Cultural District (construction period from 2021 to 2026)
¡P
Artist Square Bridge of West
Kowloon Cultural District (construction period from 2020 to 2022)
¡P
Piers in the West Kowloon
Cultural District (construction from 2022 to 2023)
2.13
Public
Concern
2.13.1.1
During the meeting of Yau Tsim
Mong District Council in November 2014, one of the
council members indicated that the elevated Nga Cheung Road was already very
congested and could only be used as a back up route
for vehicular diversion. The council member also had the view that only by
constructing an additional northbound traffic lane next to the WHC Kowloon Exit
that headed straight to Route 3 could the vehicular flow from the WKCD be
genuinely diverted.
2.13.1.2
The project profile was
submitted to the Environmental Protection Department (EPD) on 4 April 2019 and
was exhibited for public consultation between 5 April 2019 to 18 April 2019. No comments from the public or the
District Council have been received.