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Noise Barrier
Noise Barrier
The Vietnam North-South Expressway is the country’s main north–south road corridor, and long stretches of it run close to towns, schools and homes. Barriers were supplied for the sections where the noise model showed the highest exceedance — the densely populated stretches and the eco-sensitive zones along the alignment — rather than as one continuous wall.
Our scope on this project was the manufacture and supply of the barrier panels and steel framing. Foundations, erection and all site works were carried out by the project contractor.
Modular sound-absorbing panels with a perforated metal facing and acoustic infill
Corrosion-resistant coated steel posts and framing
Panels finished for tropical service, with a UV-stable outer skin
Modules sized for phased delivery, so the contractor can close sections as traffic is switched
Noise is assessed as part of the environmental approval for Vietnamese road projects, and a barrier is the usual mitigation where the predicted level at nearby homes would otherwise exceed the permitted limit. On a corridor like the North-South Expressway the problem is not only traffic volume but timing: night freight and early morning flows carry further in still air, which is when residents notice it most.
Height and acoustic class were set section by section from the noise model, not applied as one standard wall. Where the predicted level at the nearest homes was highest, the panel stack was raised on a concrete base; where the corridor runs past open ground, the barrier stops. Panel type, coating and UV stability were then matched to the climate the barrier has to live in — high humidity, heavy seasonal rain and strong sun.
A noise barrier is a wall of absorbing or reflecting panels erected between the road and the receivers behind it. It works by interrupting the direct path of the sound: the panel absorbs part of the energy and its top edge forces the rest to travel further, so the level at nearby homes falls. Vietnamese expressway projects use them where predicted traffic noise at nearby homes exceeds the permitted limit.
Height is set by the noise model for each section, not by a single fixed figure. The barrier is built as a stack — panels on a concrete base — and the stack is raised until the predicted level at the nearest receiver meets the limit. Because each additional metre delivers less benefit than the one below it, height and panel acoustic class are optimised together rather than height alone.
They do different jobs. Perforated metal panels absorb sound and are the usual choice for long expressway runs. Concrete is heavy and inexpensive but reflects sound and needs a heavier foundation. Transparent panels in acrylic or solid polycarbonate are used where daylight or sightlines have to be kept, and cost more per square metre. Many projects mix them: metal for most of the alignment, transparent panels opposite windows.
For the sections supplied here the design target was a reduction of up to 20 dB(A) at the nearest receivers. Real performance depends on how much of the barrier a receiver can “see”: a barrier only attenuates sound that has to pass over its top edge, so a home on a slope above the road gains less than one at road level.
Barriers are priced per square metre of panel, so the figure moves with height, panel type, acoustic class, coating and the number of posts per metre. Transparent panels cost more than metal, and a taller stack costs more than a short one because both panel area and foundation grow. Send the wall-line length, the required height or target reduction, and the panel type you have specified, and we will price against your bill of quantities.
Noise limits and the requirement to mitigate are set in the project’s environmental approval and in the Vietnamese technical regulations applicable to road works; the acoustic performance target is written into the project specification. Our scope is to manufacture panels to the specified acoustic class and coating, so the barrier meets the performance the designer has committed to.
Service life follows the coating system and the maintenance regime. The panels supplied here use a corrosion-resistant coating and a UV-stable outer skin selected for Vietnamese humidity and sun. In service, the checks that matter are the panel fixings, coating damage at the base where water sits, and the acoustic infill where a panel has been impacted.
Opaque metal panels do block the view, which is why transparent panels are used opposite homes and on viaducts where daylight matters. Panels can also be supplied with a mesh upper section to keep the barrier visually lighter, as on this project. Greening is possible — climbing plants on the road face are common in Europe — but it needs an irrigation and maintenance plan, and the planting must not cover the acoustic face.
Send the wall-line length, required height or target reduction, panel type and destination port, and we will confirm the specification and price for your bill of quantities. Jinbiao has manufactured noise barrier panels for expressway, viaduct and industrial projects since 1990.
This project case covers the installation of metal noise barrier panels along the outer edge of an elevated bridge structure. Green and white panels, mounted on metal frames, are used to control traffic noise for the surrounding residential area.
Modular metal noise barriers were supplied for the sections of the Vietnam North-South Expressway where traffic runs closest to homes. The barrier pairs sound-absorbing perforated panels with a coated steel frame, and is specified to cut roadside noise by up to 20 dB(A) while withstanding Vietnam’s humidity, monsoon rain and UV load.
In 2024, Macao launched a forward-thinking infrastructure initiative to address noise pollution challenges along the A2 Bridge, a vital transportation link connecting key urban and economic zones. The project underscores Macao’s commitment to balancing rapid urban development with environmental sustainability and community well-being.
