AASHTO TNA-1, Policy on Land Use and Source Control Aspects of Traffic Noise Attenuation, sets out the association's position on reducing traffic noise through measures other than barriers, namely land use planning and control of the noise sources themselves. It discusses the division of responsibility between highway agencies and local governments, the tools available for compatible land use near highways, and the limits of source control for tires, engines and pavements. The policy is aimed at planners, environmental specialists and highway officials who deal with noise abatement beyond the roadway edge.