An Expert System for Recommending Speed Limits in Speed Zones (2007) / Chapter Skim
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Research Results Digest 318 May 2007 SUMMARY This digest describes research conducted to develop a knowledge-based expert system decision-support tool for recommending speed limits in speed zones on highways and local roads that are considered credible and enforceable. The tool is intended to assist responsible authorities in setting speedzone limits to enhance traffic safety and operating efficiency.
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these rules were derived. The third section describes the software application and its use.
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risk or higher tolerance for risk may decide to drive faster than might be considered by others to be appropriate for roadway conditions. The higher speed increases the probability of a crash involving property damage and possibly injury or death for the driver and others.
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NCHRP Project 3-67 was designed to produce an expert system to succeed USLIMITS. The new system would be made available with complete information about the system's logic and factors influencing speed-limit recommendations.
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is, if the observed crash or injury rate is higher than the corresponding critical rates or at least 30% higher than the corresponding average rates, a reduced speed limit may be recommended. Whether one or the other approach is used is determined by the availability of data.
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6APPENDIX: EXPERT SYSTEM DECISION RULES AND LOGIC FOR USLIMITS2 This document contains flow charts (numbered K-3 through K-30) describing the decision rules for the expert system for recommending speed limits in speed zones that was developed as part of NCHRP Project 3-67.
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Transportation Research Board 500 Fifth Street, NW Washington, DC 20001 These digests are issued in order to increase awareness of research results emanating from projects in the Cooperative Research Programs (CRP)
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