Measuring and Communicating the Effects of Traffic Incident Management Improvements (2004) / Chapter Skim
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4 2 SUMMARY OF CURRENT PRACTICE 2.1 Estimating the Benefits of Traffic Incident Management Programs Several traffic incident management programs were surveyed to identify good practices in benefit estimation and communication. The seven responders in Table 2.1 represent 12 different regions; the Caltrans response from the Traffic Operations Division includes six regions (Los Angeles, San Francisco, San Diego, Orange County, Sacramento and San Bernardino)
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Table 2.1 System and Service Patrol Information Traffic Incident Management Service Aspect Baltimore California Cincinnati Milwaukee Minneapolis- St. Paul Orlando Seattle No.
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Table 2.2 System and Service Patrol Information Baltimore California Cincinnati Milwaukee Minneapolis- St. Paul Orlando Seattle Data Collection Element Coll Arch Coll Arch Coll Arch Coll Arch Coll Arch Coll Arch Coll Arch Speed data from pointsource detectors 9 9 9 9 9 9 9 9 9 9 9 9 9 Travel time information from probes or electronic toll collection tags 91 91 9 9 9 9 9 Traffic volume data (please include data collection technology used)
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7 2.1.3 Incident Information A variety of information is collected for the type and severity of freeway incidents. The number of incidents and type or severity is collected for all responding systems, but not in the same way or with the same level of detail (Table 2.3)
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Table 2.3 Incident Information Incident Information Baltimore1 California Cincinnati Milwaukee Minneapolis- St. Paul Orlando Seattle Number 9 9 9(~1100 per month)
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Table 2.4 Performance Measures Measure Baltimore California Cincinnati Milwaukee Minneapolis- St. Paul Orlando Seattle Response Time Call received to response vehicle arrival.
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Table 2.5 Benefit Assessment Components Benefit Component Baltimore Cincinnati Milwaukee Minneapolis-St. Paul Orlando Seattle Delay Reduction Added delay due to incidents is calculated.
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11 2.2 Marketing Traffic Incident Management Programs Appendix B presents several specific examples of efforts undertaken by state DOTs to market traffic incident management and operations in general. These efforts have a common theme: produce benefit estimates that have been verified, communicate them in simple terms that laypersons can understand, and rely on graphic presentations of technical material.
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