United States Department of Transportation
i
Cross Slope Verification Using Mobile Scanning on SCDOT Highways
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2018-06-01
[PDF-8.03 MB]
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Edition:Final report
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Abstract:Ensuring adequate cross slopes on South Carolina highways and interstates is an important safety practice. When cross slopes are too flat, too steep, or vary across the travel lanes, a number of safety issues can occur (i.e., hydroplaning, loss of control, and run-off-road crashes). South Carolina Department of Transportation (SCDOT) is seeking to evaluate the use of Mobile Terrestrial Light Detection and Ranging (LiDAR) Scanning (MTLS) to collect accurate cross slope data on South Carolina highways and interstates. This study provides a wide-ranging technical and economic evaluation of multiple mobile scanning systems in terms of accuracy and precision of collected cross slope data and procedures to calibrate, collect, and process data. The research approach covered various work elements including detailed profile, alignment and cross section comparisons, and ground proofing using conventional survey methods. This study included an examination of current and historical data collection methods, specifications, and standard practices used by other transportation agencies with regard to cross slopes. Results of this research proved the feasibility of MTLS in comparison to manual data collection methods to obtain cross slope and estimate pavement material quantities. Beyond feasibility, the study proved that MTLS is safer than conventional surveying because it does not require personnel to be located in or near the travel lanes, and it also increases productivity by significantly reducing the time needed to collect the data. Further, the MTLS data uses are many and can be beneficial to virtually all state highway agency employees who work with spatial data for asset collection, design, planning, estimating, and many other applications.
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