Danish road authorities in conjunction with industry and consultants have worked out a system for the specification and documentation of noise reducing asphalt pavement. The system is based on the Close Proximity Method (CPX) and encompasses o A guide to the use of asphalt surfacings in traffic noise abatement. o A system for the documentation and declaration in classes of the noise reduction of the asphalt surfacing o Three classes A, B & C, where class A surfacings exhibit the highest noise reducing effect and class B & C exhibit lower noise reducing effects as compared to regular dense graded asphalt surfacings. o Reference values of the noise emission as determined by the CPX method. o Description of the CPX method including the definition of method variables and requirements on supple-mentary calibration of the measuring device. o Paradigm for use in contracting and preparation of tender documents. The system is a first attempt in Denmark for contracting noise reducing asphalt surfacings. The system has some limitations and several subjects need to be addressed in the future development of the system. Especially there is a need for better knowledge on the accuracy offered by the CPX method, and for the development of appropriate acceptance criteria to be used in contracting.