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17 Projects 17-26 and 17-29 in developing AMFs for the safety judged to be of high or medium-high quality from a critical prediction tools they were developing for urban/suburban review of existing research literature. This effort was closely arterials and rural multilane highways. Because of the large coordinated with other ongoing NCHRP efforts to docu- number of serious and fatal crashes that occur on two-lane ment AMFs for the upcoming publication of the HSM. rural roads, much of the past AMF development work had Indeed, the criteria used to make this judgment of AMF focused on treatments for that roadway class. Literature on quality were the basis for similar AMF reviews in the HSM AMFs for other roadway classes is limited. It was hoped that project. The project team then developed a unique process expert panels might be able to combine the limited past eval- for identifying high-priority AMF research needs that incor- uations specific to these two roadway classes with modified porates the priorities of DOT practitioners, the current level versions of two-lane AMFs to develop the needed estimates. of AMF quality, knowledge of other ongoing or future re- It was also hoped that this option might produce multiple search that might enhance certain treatment AMFs, and a AMFs at a cost lower than the cost of new analyses. The measure of the effect on crash harm that a specific treatment results of these efforts are presented in Chapter 4. might have if implemented widely. For those treatments that were ranked highest in terms of need by this procedure, the team explored available state and national databases and Summary proposed a research strategy to develop or improve the AMF The Phase I efforts of this research study identified 100 for each treatment. Working with the project oversight treatments that are used by state and local DOTs, ranked panel, a final list of research tasks for the Phase II effort was these treatments based on inputs from a state DOT user sur- developed. The research conducted is described in the next vey, and produced documentation of 20 AMFs that were two chapters of this report.