On some concrete sections of the A12 in NE Essex and parts of the A14 near Ipswich in South Suffolk the Highway Authorities have machined a series of closely spaced grooves parallel to the direction of travel. The effect is a very large reduction in road noise compared to the normak grooves at right angles to the direction of travel. These are obviously short test sections but does anyone know if this is likely to become a standard practice as the noise reduction make s driving so much quieter and enjoyable.

Derek