How FRP Manhole Covers Reduce Road Noise

A recurring problem in cities, road noise disturbs neighborhoods and lowers quality of life.  Fiber Reinforced Plastic FRP manhole cover offer a compelling solution to mitigate this problem, outperforming traditional cast iron covers. Unlike metal covers, which often rattle or clang under vehicular traffic due to loose fittings or wear, FRP covers are designed for a precise fit and stability. Their lightweight yet robust construction—up to 70% lighter than cast iron—ensures a snug seal within the frame, reducing vibrations and noise caused by passing vehicles. This tight fit minimizes the “clunking” sound common with metal covers, especially on busy roads.

FRP’s inherent damping properties further contribute to noise reduction. Unlike rigid metals that amplify sound, FRP absorbs and dissipates vibrations, resulting in quieter road surfaces. Studies have shown that FRP covers can reduce noise levels by up to 10 decibels compared to cast iron, a significant improvement in high-traffic areas. For example, a city in Japan implementing FRP covers on a major thoroughfare reported a noticeable decrease in resident complaints about traffic noise. Additionally, FRP’s corrosion resistance prevents degradation that could loosen covers over time, ensuring consistent noise reduction throughout their 20+ year lifespan.

The customizable nature of FRP allows for tailored designs, such as reinforced edges or rubber gaskets, which enhance sealing and further dampen sound. These features are particularly valuable in residential zones or near schools, where noise pollution impacts health and productivity. FRP’s non-conductive properties also make it safe for use near electrical utilities, broadening its application in urban settings. By reducing road noise, FRP manhole covers contribute to quieter, more livable cities, supporting municipal efforts to improve environmental quality and resident well-being.