Accident Modification Factors for Traffic Engineering and ITS Improvements (2008) / Chapter Skim
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Pages 9-17
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From page 9... ...
, documents identified through the Transportation Research Information Service (TRIS) and other resource search engines, and references being reviewed in developmental work for the HSM.
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. The study must also have included a sufficiently large number of treatment sites, a large reference group composed of comparable sites, and enough crashes for statistical validity.
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First, the information was included in an "AMF Knowledge Matrix" that provides a status report on the quality of AMFs for these 100 treatments, as indicated by checkmarks within the cells in Table 1. In addition to the measure of AMF quality, the matrix also provides information on the user priority level for the 25 highest rated treatments and information on other ongoing or planned research that would potentially increase the quality of the AMF.
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Flatten vertical curve Add static curve warning signs and/or pavement markings Add dynamic curve warning sign Table 1. AMF knowledge matrix showing AMF quality, user priority, and ongoing or future research for 100 intersection, roadway segment, and miscellaneous treatments.
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Install mid-block pedestrian crossing Level of Predictive Certainty Treatment User Priority Level High Medium- High Medium- Low Lo w Non- Existen t Ongoing/ Future Work Add shoulder rumble strips 5 ( 53 )
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Add exclusive right-turn lane High * Install an urban traffic signal High Remove an urban traffic signal High Modify signal change interval Medium-High Convert to all-way stop control Medium-High Convert stop-control to yield-control Medium-High Install red-light cameras High Roadway Segment Treatments Narrow lane widths to add lanes Medium-High Add passing lanes (two-lane roads)
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ML Add static curve warning signs and/or pavement markings Non-Existent H (2,3) H Add shoulder rumble strips (freeways)
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MH Add shoulder rumble strips (twolane/others) MH Add edgeline rumble strips MH Eliminate left turns at driveways MH Flatten sideslopes MH Install roadway segment lighting MH Add advance curve warning signs/onpavement markings H Increase pavement friction MH Add midblock pedestrian signal MH Raise crosswalks (non-intersection)
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From page 17... ...
Literature on AMFs for other roadway classes is limited. It was hoped that expert panels might be able to combine the limited past evaluations specific to these two roadway classes with modified versions of two-lane AMFs to develop the needed estimates.
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