Do FRP Manhole Covers Reduce Road Noise?

FRP manhole cover can indeed reduce road noise, offering a quieter alternative to metal counterparts. Cast iron covers often clank under traffic, especially when loose or worn, creating a persistent urban nuisance. FRP, being lighter and less rigid, dampens vibrations more effectively. Its composite structure absorbs impact energy rather than amplifying it, resulting in a softer thud or no sound at all when vehicles pass over. Studies suggest noise reductions of up to 10 decibels compared to iron, a significant improvement in busy areas. Additionally, FRP’s tight fit—thanks to precise molding and optional gaskets—minimizes rattling, a common issue with metal covers on uneven roads. However, noise reduction depends on installation quality and cover design; poorly secured FRP can still generate sound. For cities prioritizing livability, this acoustic benefit, combined with FRP’s durability and low maintenance, makes it an appealing choice to enhance urban soundscapes.