Evaluation of Data Needs, Crash Surrogates, and Analysis Methods to Address Lane Departure Research Questions Using Naturalistic Driving Study Data (2011) / Chapter Skim
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A P P E N D I X C Assessment of Availability of Roadway Data Elements in the SHRP 2 Naturalistic Driving Study Data Acquisition SystemBackground A preliminary test run of the SHRP 2 data acquisition system (DAS) was evaluated to determine what roadway data elements could feasibly be extracted in the event they are not available in roadway data sets from SHRP 2 Safety Project S04A (Roadway Information Database Developer, Technical Coordination, and Quality Assurance for Mobile Data Collection)
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125Figure C.1. Trace of DAS activity data.Figure C.2.
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126Table C.1. Identification of Curve Data Elements and Roadway Cross-Section Features Data Element Features DAS Horizontal curvature Vertical curvature Cross section Shoulder Presence Length Location Presence and type of spirals Tangent length between adjacent curves Radius or degree of curve Presence and amount of superelevation Direction of curve Curve deflection angle Vertical curve length Tangent length between adjacent curves Grade (percent)
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127Table C.2. Identification of Signs by Type Data Element Features DAS Regulatory signs Warning signs Guide signs Service signs (e.g., camping, food)
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128Table C.3. Identification of Pavement Marking and Lighting Data Element Features DAS Pavement markings Illumination Edge line Centerline (e.g., dashed, solid)
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129Table C.4. Identification of Roadway Surface and Clear Zone Characteristics Data Element Features DAS Road surface Roadway defects Clear zone Surface type (e.g., gravel, asphalt, PCC)
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130Table C.5. Identification of Other Countermeasures and Access Data Element Features DAS Other countermeasures Access Bridge structures Type of edge line or shoulder rumble strips Location of edge line or shoulder RS Type of centerline rumble strips Location of centerline rumble strips Advance stop line rumble strips Type of speed feedback signs Channelizers, delineators Presence of safety edge Automated speed enforcement Cable barrier Crash attenuators/cushion Vertical deflection (e.g., speed tables, raised intersection)
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131Figure C.3. Identification of cross-section elements: (a)
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Figure C.4. Identification of sign types: (a)
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Figure C.5. Identification of pavement markings and lighting: (a)
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134Figure C.6. Identification of roadway surface and clear zone elements: (a)
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135Table C.6. Identification of Intersection Features Data Element Features DAS Cross section Intersection control Other countermeasures Other Intersection/interchange type (includes railroad)
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138Figure C.10. Vehicle crossing stop bar during yellow.Table C.7.
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139Figure C.11. Method to compare objects in mobile mapping database with features identifiable in the DAS forward view.Table C.9.
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140point of the rumble strip section was located. The presence of guardrail in the forward video was easily identified.
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Integration of Analysis Methods and Development of Analysis Plan (S02) Roadway Measurement System Evaluation (S03)
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