Roadway Measurement System Evaluation (2011) / Chapter Skim
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Recommended Roadway Data Elements A reduced set of data elements for collection during the S04B project was developed by considering the following four items: • Data elements reported by the teams; • Rodeo target accuracies for each data element; • Desired data element accuracies to research the causes of rural, run-off-road, single vehicle accidents, as presented in SHRP 2's forthcoming S01E report (1)
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Table 4.1. Data Elements for Rural, Run-off-Road Accidents in SHRP 2 Safety Project S04B Rodeo CTRE Best Target Desired Achieved Recommended Feature Data Element Definition Accuracy Accuracy Accuracy Accuracy Assets Barrier Systems Pavement Markings Roadside Obstacles Rumble Strips Signs Street Lighting Driveways Barrier type Location Barrier beginning location Barrier ending location Barrier offset -- beginning Barrier offset -- ending Barrier height Post type End treatment type -- beginning End treatment type -- end Location of marking -- begin Location of marking -- end Marking type Cable, W beam, tri beam, box beam, concrete barrier, other Roadside or median GPS coordinates of the beginning of entire barrier system GPS coordinates of the end of entire barrier system From edge of lane to face of barrier (in.)
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Data Elements for Rural, Run-off-Road Accidents in SHRP 2 Safety Project S04B (continued) Marking offset Centerline marking type Special pavement marking location Special pavement marking description Raised pavement markers present Location of raised pavement markers Type of roadside obstacles Offset of roadside obstacle Location of roadside obstacle Rumble strip lateral location Location of rumble strip -- begin Location of rumble strip -- end Rumble Strip Offset Support type Support location Lanes Offset of each type of line (center, lane and edge)
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Data Elements for Rural, Run-off-Road Accidents in SHRP 2 Safety Project S04B (continued) Roadway Inventory Multi-sign Sign type(s)
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Rodeo CTRE Best Target Desired Achieved Recommended Feature Data Element Definition Accuracy Accuracy Accuracy Accuracy Roadway Inventory• Mixed road types from interstates to locals. • Discontinuous survey segments.
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Teams 03, 04, 05, 08, and 10 did not seem to understand that Scenario 1 required the most intensive data processing, as evidenced by their costs going up for Scenarios 2 and 3, even though data processing for the latter two was less. Considering the responses received from the participants, the reduced data elements list for S04B, and the research team'sScenario 1 Scenario 2 Scenario 3 Estimated Estimated Estimated "Ball Park" "Normal" "Ball Park" "Normal" "Ball Park" "Normal" Costs Turnaround Costs Turnaround Costs Turnaround Team ($/mile)
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From page 25... ...
• Table 3.1 contains a list of 88 data elements that can be used to help researchers answer a wide range of highway safety questions for both urban and rural environments; and • Table 4.1 contains a list of 53 data elements that can be used to help researchers answer highway research questions relat-ing to issues in rural environments, most notably rural, runoff-road accidents. The cost implications for research-grade mobile data collection depend on the following general items: • Cost of the field data collection; • Data analysis methods employed; • Quality control measures needed to reach the desired data accuracies; and • Project time frame.
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