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Executive Summary Introduction The practice of pavement preservation (i.e., preventive maintenance [PM] and some forms of minor rehabilitation and corrective maintenance) is a growing trend among transportation agencies throughout the United States. However, the practice of preservation on high-traffic-volume roadways is not nearly as common as it is on lower-traffic-volume roadways. The following are possible explanations for this: · Agencies may associate the use of specific PM treatments solely with low-volume roads, thereby assuming that they are not appropriate for other uses. · Agencies may have concerns over the liability and risk associated with failure (when a treatment fails on a higher-volume roadway, more people are affected and more people complain). · The benefits of preservation on higher-traffic-volume roadways might not be as readily recognized or as well documented. · Preservation treatments may not be as effective on higher-traffic-volume roadways. They may deteriorate in different ways from those applied on low-volume roadways because of the higher standards used in design and construction of higher-traffic-volume roadways. Nonetheless, the preservation of high-traffic-volume roadways is as important as the preser- vation of lower-traffic-volume roadways, as many conditions hold true for both: · Agency resources are limited and pavement preservation saves money in the long run. · Preservation provides benefits to the traveling public, including safer and smoother roads. · Preservation can be done more rapidly than rehabilitation, with fewer adverse effects on the traveling public. Admittedly, there are also challenges to the use of preservation strategies on high-traffic-volume roadways (e.g., a smaller toolbox of treatments that can be used successfully, more difficult treatment construction because of shorter available closure times, less available information on treatment performance and life, increased risk, and less available guidance on preservation strategies). Nonetheless, it is believed that the benefits of practicing preservation on high-traffic-volume roadways outweigh the challenges and that it is worthwhile to take steps to increase or improve the practice of pavement preservation on these roadways. The main objective of the research performed under SHRP 2 Renewal Project R26 was to develop guidelines on pavement preservation strategies for high-traffic-volume roadways that can be implemented and used by public agencies. A secondary objective was to identify promising pavement preservation strategies for application on high-traffic-volume roadways that might not commonly be used and to make recommendations for further research opportunities. 1