Noise Classification for Tendering Quiet Asphalt Wearing Courses

Road administrations request noise reducing pavements and the industry has introduced new products claimed to have noise reducing properties. As a cooperative effort, the Danish Road Directorate, the paving industry and consultants have established a system for specifying such asphalt wearing course systems. Road administrations can now tender pavements with a certain class of traffic noise reduction, based on the Close Proximity (CPX) noise measurement method, ISO/CD 11819-2.The system represents a first Danish attempt to contract road works comprising noise reducing asphalt wearing course systems based on their functionality. Further development is foreseen concerning the CPX measurement accuracy and the acceptance criteria to be used in contracting.