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Enhancing and Generating GDOT’s MUTCD Curve Sign Placement Design with Curve Finder and Curve Sign Determination
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2024-05-01
[PDF-5.44 MB]
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Edition:Final Report (August 2020 – May 2023)
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Abstract:To meet MUTCD requirements for curve sign design, the Georgia Department of Transportation (GDOT) developed a MUTCD-compliant curve sign design practice that uses the Curve Advisory Reporting System (CARS) system developed by the Rieker company. However, processing the CARS data collected by GDOT using Rieker devices is labor-intensive, time-consuming, and requires manual identification and processing of each separate curve. The objectives of this project are: 1) to enhance GDOT’s current curve sign design practice by refining and using the curve finder (Smart-Curve Information Extraction, Smart-CIE) and the MUTCD curve sign design computation algorithms, both of which have already been developed by Georgia Tech; 2) to process GDOT’s already-collected CARS data more consistently, accurately, and efficiently on nearly 18,000 centerline miles of state-maintained routes; and 3) to generate inventories of curves and MUTCD-compliant curve warning signs in both tabular and GIS formats to meet MUTCD curve sign design requirements and to support GDOT’s sharp curve safety analysis using the AASHTOware Safety Powered by Numetric system. The enhanced curve finder and MUTCD-compliant curve warning sign design computation algorithm have been used to successfully process nearly 18,000 miles of Georgia state-maintained routes. A total of 13,262 curves have been identified, and 29,093 signs have been designed. These generated inventories of curves and the MUTCD-compliant curve signs have been delivered in both tabular and GIS formats to GDOT. GDOT has already successfully implemented and used these outcomes for its sharp curve safety analysis and safety improvement planning.
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