The Trunk Road T4 is a strategic infrastructure project connecting Shing Mun Tunnel Road/Tsing Sha Highway and Sha Tin Road. Upon completion of Trunk Road T4, residents of New Territories East can travel directly to Tsuen Wan and West Kowloon
without having to go through the local roads in Sha Tin town centre, thus relieving the traffic condition in the area. Considering the future housing developments and the development of the Northern Metropolis, the population in New Territories East will further increase. The Trunk Road T4 will become an indispensable part of the road network by enhancing the overall transportation infrastructure for commuting between New Territories East and Kowloon.

The Trunk Road T4 and Associated Works (Contract No. ED/2022/02) commenced on 26 August 2024.


Project Scope

The works mainly include:
1. construction of a dual two-lane trunk road of approximately 2.3 kilometers in length with slip roads connecting Shing Mun Tunnel Road/Tsing Sha Highway and Sha Tin Road;
2. widening of a section of Sha Tin Road near Pok Hong Estate of approximately 150 meters in length, from a dual two-lane carriageway to a dual four-lane carriageway;
3. construction of three elevated footpaths across Che Kung Miu Road, Shing Mun River Channel and the proposed trunk road near Sha Tin Tau Village respectively, and one elevated footpath cum cycle track across Lion Rock Tunnel Road for reprovisioning of existing pedestrian and cycling facilities affected by the project;
4. ancillary works including civil, geotechnical, drainage, sewerage, water, utilities, lighting, landscaping, electrical and mechanical works, construction/reconstruction/demolition of noise barriers, construction of retaining walls and slope improvement works; and
5. implementation of environmental mitigation measures and environmental monitoring and audit programme.


Innovative Technologies

Constructing a new highway across existing major roads and railway lines in densely populated and bustling areas is always challenging, but the project team are actively tackling these difficulties. To further enhance construction efficiency and ensure site safety, the team continue to introduce innovative technologies, striving to minimize the impacts on the community.

．Water-Filled Barriers with Intelligent Monitoring System
As most of the site areas of T4 project are located along major highways in the district, thousands of water-filled barriers are used to separate the works areas and carriageways. To enhance road safety, the project team have adopted an innovative monitoring system which is being tested on approximately 130 units of water-filled barriers at Sha Tin Road, allowing real time monitoring of the water level in each barrier unit. The data is instantly transmitted to the monitoring system via 5G network. The project team will be informed when leakage and low water level are detec ted and take necessary rectification.

．Adoption of new noise mitigation technologies
The T4 project team under stands the community’s concerns about noise nuisance. At works sites close to residential areas, inflatable noise barriers have been installed, which can be flexibly mobilized according to workflow. Machinery parts that generate noise have been wrapped with sound insulation materials. In addition, the team has adopted noise barriers made from novel recycled plastic materials. These barriers not only reduce noise effectively but are also environmentally friendly, further minimizing construction sound levels.

．Modular Pontoon Barge
To facilitate the construction of elevated footpath cum viaduct across the Shing Mun River, thorough assessments were conducted to manage challenges anticipated at the river channel, including tidal fluctuations and water flow. The construction approach was tailored by combining flexible methodologies with innovative technology. The deployment of a modular pontoon barge and a temporary working jetty is scheduled for the second half of 2026 to construct the viaduct using prefabricated segments.

The construction of traditional temporary working platforms is subject to various constraints, including the limitations of dry-season schedule and the potential impacts of temporary piles on river flow and existing riverbed structures. The team decided to adopt a modular pontoon barge which can effectively reduce channel occupation, protect the riverbed, minimise environmental and ecological impact as well as save construction time, and optimize construction stability. The preliminary tasks including riverbed geotechnical investigations and water quality monitoring have been completed.


Project Progress

To facilitate the construction of the viaducts and underpasses of the Trunk Road T4, a section of footpath on the Lion Bridge at the Lion Rock Tunnel Road, and the pedestrian subway at the junction of Lion Rock Tunnel Road and Che Kung Miu Road are closed from 1 November 2025.

Ongoing works on western side of Shing Mun River
1. Slope protective fence installation at Shing Mun Tunnel Road to facilitate slope stabilisation works;
2. Bored piling works at Tai Wai Nullah;
3. Sheet piling works near Shing Wan Road;
4. Construction of bored pile, pile cap and bridge pier near the Hong Kong Heritage Museum.

Ongoing works on eastern side of Shing Mun River
1. Pipe piling, sheet piling and installation of lateral support for excavation at the works sites at the junction of Tai Chung Kiu Road and Lion Rock Tunnel Road;
2. Pipe piling works at Sha Tin Tau Village;
3. Slope modification works at Lion Rock Tunnel Road near Tsang Tai Uk;
4. Excavation works at Sha Tin Road.



Source of Information and Pictures: “Trunk Road T4” Website of Civil Engineering and Development Department