Moving lane closures are an increasingly utilized and inherently hazardous traffic control procedure for highway maintenance and operations activities. To improve the safety of moving lane closures for workers and motorists, this research studied driver behavior around moving lane closures and the effect of different components of current traffic control scenarios, including the number, configuration, and spacing of shadow vehicles, and the effect of various traffic control devices and sign messages. This report presents the results of Phase I of this study and includes the findings of full-scale field experiments performed at four locations. A future Phase II of the research will expand on these findings and produce specific recommendations for revisions to current traffic control standards to improve the safety of moving lane closures for highway workers and the travelling public.

Moving lane closures are an increasingly utilized and potentially hazardous traffic control procedure for highway maintenance and operations activities. To improve the safety of moving lane closures for workers and motorists, this study investigated driver behavior around and in moving lane closures and the effect of different components of current traffic control scenarios, including the number, configuration, and spacing of shadow vehicles, and the effect of various traffic control devices and sign messages. This report presents the study's Phase II efforts, including a series of large group meetings, an expert panel review of the findings, and recommendations for revisions to traffic control standards to improve the safety of moving lane closures for highway workers and the traveling public. The Phase I findings, including the results of full-scale field experiments, were reported previously.

TRB's National Cooperative Highway Research Program (NCHRP) Research Results Digests 339: Improving the Safety of Mobile Lane Closures explores practices employed by transportation agencies during mobile lane closures and summarizes research carried out on different components of mobile lane closure. Appendices A through D for NCHRP RRD 339 are available online.

The purpose of this manual is to provide clear and helpful information for maintaining gravel roads. Very little technical help is available to small agencies that are responsible for managing these roads. Gravel road maintenance has traditionally been "more of an art than a science" and very few formal standards exist. This manual contains guidelines to help answer the questions that arise concerning gravel road maintenance such as: What is enough surface crown? What is too much? What causes corrugation? The information is as nontechnical as possible without sacrificing clear guidelines and instructions on how to do the job right.