may help redressing road traffic noise.
The use of
brushed concrete as a road surface can contribute
significantly to urban road noise levels
due to the interaction of tyres with this
rather rough surface.
To redress the impact of traffic noise on residents living close to high speed roads of brushed concrete surface, a 300-metre section of the Island Eastern Corridor was in 1987 resurfaced with an open-textured material, which is a type of bitumen for testing its noise reduction and engineering performance. The material was found to perform satisfactorily and provided a noise reduction of up to 5 dB(A) in the two-year trial period.
a promising result, the Government in 1989
started the Quiet Road Surface Programme.
In this programme, suitable road sections are re-surfaced
with an open-textured materials which help
to reduce traffic noise. Please click on
the demo button to see the details.
The programme for resurfacing suitable high speed roads with noise absorptive material was completed in 1999. A total of 11 kilometres of roads were resurfaced, providing noise relief to some 15,650 dwellings, as indicated by this chart. Please click on the demo button to see the details.
This kind of low noise surface material is now a standard for all new high speed roads. In November 2000, the Executive Council endorsed a new policy to address the noise impacts from existing roads. One of the strands of this new policy is to re-surface suitable local roads with an open-textured materials. 72 local roads have been identified as suitable for resurfacing. Some 40,000 flats will benefit once all 72 roads are re-surfaced.
Selection criteria for roads to be resurfaced include:
- The road should be relatively level (otherwise engine noise will dominate);
road should originally be paved with
brushed concrete or other similar non-open
textured surfaced (producing a high
level of road/tyre noise);
road must carry smooth high speed traffic
(where road/tyre noise will be a problem)
with a low percentage of heavy vehicles;
traffic noise from the road is a dominant
noise source (reducing which will become
details on how low noise surface material
works please click here.