Hangzhou Urban Expressway Noise Barrier Project

2.5m High Metal Louvered Acoustic Panels with Openable PC Transparent Panels

As traffic volume on urban expressways continues to increase, vehicle-generated noise has become a growing concern for nearby residential communities, commercial districts, and the overall urban environment. To improve the acoustic environment along the route, a major urban expressway project in Hangzhou, Zhejiang Province adopted a customized combination noise barrier system designed and supplied by JINBIAO.

Through an integrated sound absorption and sound insulation design, the system effectively reduces traffic noise transmission and creates a more comfortable living and working environment for surrounding areas.

The installed noise barrier system has a total height of 2.5 meters and features a combination structure consisting of metal louvered acoustic panels and transparent polycarbonate (PC) panels. The design not only meets stringent noise reduction requirements but also enhances the visual appearance of the roadway while simplifying future maintenance operations.

Project Information

Key Design Features

1. Metal Louvered Acoustic Panels for Effective Traffic Noise Control

The upper and lower sections of the barrier are constructed using metal louvered acoustic panels filled with high-performance centrifugal glass wool sound-absorbing material.

The louvered design effectively absorbs engine noise, tire-road interaction noise, and aerodynamic noise generated by passing vehicles. By reducing sound reflections, the system achieves superior overall acoustic performance.

In addition, the louver structure offers excellent waterproof and dust-resistant properties, preventing water accumulation and ensuring stable acoustic performance even under rainy or dusty conditions. The metal panels also provide outstanding weather resistance and corrosion protection, making them well suited for long-term outdoor use in Hangzhou’s climate.

2. Transparent PC Panels Improve Visibility, Safety, and Aesthetics

The middle section of the noise barrier incorporates high-transparency polycarbonate (PC) panels with a light transmission rate of approximately 70–85%.
The transparent design maintains visual openness on both sides of the roadway, reducing the sense of enclosure commonly associated with traditional solid barriers. It also provides clear sightlines for drivers, contributing to improved traffic safety.

Compared with ordinary glass, PC panels offer exceptional impact resistance—up to 200 times stronger—while remaining lightweight, durable, and highly weather resistant. Both sides of the panels are treated with UV-resistant coatings to minimize aging and maintain long-term transparency.

The transparent section also integrates harmoniously with the surrounding urban landscape, enhancing the overall visual image of the expressway.

3. Innovative Openable Transparent Panels for Easy Maintenance

One of the most distinctive features of this project is the incorporation of openable PC transparent panel modules.

Bridge lighting systems are installed along both sides of the elevated expressway. With conventional fixed noise barriers, maintenance personnel often need to remove barrier panels or use aerial work platforms to access lighting equipment, increasing maintenance costs, safety risks, and traffic disruptions.

To address this challenge, the project introduced a specially designed openable PC panel system. The panel module is equipped with handles and locking pins at the lower edge, while matching guide blocks and slots are integrated into the frame structure. This allows a single worker to easily open and close the panel when required.

Benefits of the Openable Design

Convenient Lighting Maintenance

Maintenance personnel can directly access bridge-side lighting fixtures for inspection, repair, and replacement without dismantling the noise barrier or closing traffic lanes, significantly reducing operational risks and traffic impacts.

Easy Cleaning of Transparent Panels

The openable structure allows thorough cleaning of both sides of the PC panels, helping restore transparency and extend service life.

Reduced Wind Load

When opened at an appropriate angle, airflow can pass through the barrier area, reducing wind resistance and minimizing structural stress during strong wind events.

Maintained Acoustic Performance

When closed, the panel is sealed with specialized weatherproof gaskets to ensure that sound insulation performance remains unaffected.
This innovative design reflects a modern infrastructure philosophy that balances acoustic performance with long-term operational and maintenance requirements, earning high recognition from both the project owner and maintenance teams.

Project Results

Following completion, the noise barrier system effectively reduced the transmission of traffic noise to surrounding areas. Noise levels in nearby residential zones were significantly lowered, helping alleviate long-standing noise concerns for local residents.

The combination of transparent PC panels and sound-absorbing metal panels creates a modern appearance that blends seamlessly with the urban expressway landscape. Meanwhile, the openable maintenance modules greatly improve the efficiency of future bridge lighting maintenance.

Key Achievements
✔ Effective reduction of traffic noise and improvement of the surrounding acoustic environment
✔ Enhanced roadway aesthetics and urban image
✔ Improved visibility and driving safety
✔ Convenient access for maintenance of bridge lighting systems
✔ Reduced long-term operation and maintenance costs

Conclusion

The Hangzhou Urban Expressway Noise Barrier Project successfully integrates acoustic performance, visual appeal, and practical maintenance considerations. By combining metal louvered acoustic panels with transparent PC panels and introducing innovative openable maintenance modules, the project achieves both effective traffic noise control and efficient infrastructure maintenance.

For urban expressways, elevated highways, river-crossing bridges, and other transportation infrastructure projects, this type of combination noise barrier solution provides excellent noise reduction performance while maintaining visual openness and simplifying future maintenance operations. It represents an advanced and practical approach to modern urban traffic noise management.

As a leading manufacturer of noise barrier systems, JINBIAO Group provides high-performance solutions for highways, bridges, railways, airports, and industrial facilities worldwide, helping create quieter, safer, and more comfortable environments for communities and infrastructure users alike.