TRANSPORTATION RESEARCH DIGEST
ARIZONA TRANSPORTATION INSTITUTE
from locally available pavement type and texture that will provide noise reduction. The designer will also need to specify pavement with good surface friction numbers, desirable splash/spray characteristics, and good wear characteristics at reasonable cost.
Many of the issues of quiet pavement are only partially understood. As effort on the various aspects of quiet pavement proceed, a better understanding of the problem will evolve which will allow more accurate prediction of sound levels, development of optimized lower-noise pavement designs, and direct
measurement of the properties affecting noise reductions. The FHWA is encouraging these efforts by states with the Quiet Pavements Pilot Program. At present one state is participating (Arizona) but more are expected in the near future. Other states have quiet pavement programs independent of the FHWA pilot program. Significant effort is ongoing in Europe and Japan. Over the next 5-10 years the body of knowledge about reduced noise pavement will grow substantially such that implementation of quiet pavement will be routine.