Minimizing the impact of traffic noise on the public is a priority for state highway agencies and the FHWA. As tire-pavement noise is the single largest contributor to traffic noise on many highways, increased utilization of low-noise pavement surfaces may reduce overall traffic noise or reduce the need for expensive traditional noise mitigation measures. Developing low-noise pavement surfaces that are both durable and safe is of high interest to both state highway agencies and FHWA. Utilization of low-noise surfaces may also provide a noise reduction alternative where traditional noise mitigation measures such as walls and berms are not a viable solution. Examples of problematic areas include many bridges/structures, areas with unstable slopes, locations near water bodies/wetlands, dike/levee/floodplain sectors, where utilities near roadways cannot be moved, and in heavily urbanized areas within a built environment. Research into these low-noise pavement treatments and materials is beginning in earnest in a variety of states. Coordinated sharing of research development, evaluation techniques, and study results is critical to reduce overall costs for key research pieces, reduce redundancy of effort, focus funding in the most needed areas, and find viable solutions that can be implemented expeditiously for the highest number of states. In short, a collaborative effort can create greater benefits than the independent efforts of individual states.

The objectives of this research are as follows: - Provide a forum for states to discuss tire/pavement noise issues and develop a proposed research plan. - Pool resources and efforts of multiple state agencies and industry to perform tire/pavement noise research in a similar manner (avoiding duplication) and sharing of data.

The anticipated scope of the study would consist of the following tasks: - Provide a forum for states to discuss noise issues, utilize the same techniques to build a larger database, and share data. The ultimate goal is to incorporate pavement type into the FHWA Traffic Noise Model. - Perform a synthesis of global practice in regards to utilizing pavement technology for decreasing tire/pavement noise; - Perform a synthesis on the cost/benefits of using low-noise pavements; - Produce a document for general public information regarding noise reduction; - Provide a baseline for quieter pavement discussion (e.g. definitions, list of acronyms, etc.); - Provide a guideline for best practices in measuring and evaluating noise benefits and decreases over the wearing life of the roadway surface. A technical advisory group consisting of a pavement expert and a noise expert from each contributing agency and invited participants will refine/expand this scope of work and provide technical input/guidance throughout the duration of the research. Much of the initial scope of work has been completed. The Principal Investigator is currently working on a list of activities that benefit the member states including: - B&K Pulse Data Analysis Routine - NI System Development - OBSI Calibrator - Have a Tire loading scale for member states to use when needed - New SRTT Tire Evaluation

This study is open to all states; however, a minimum contribution of $10,000 will be required to be a member of the Technical Advisory Committee (TAC). The TAC will provide guidance for the study and review and comment on all documents produced by the research team. This contribution will pay for the research conducted and travel to the annual meeting for a pavement expert and noise expert.