Roughness analysis of grade breaks at intersections : final report.
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1993-03-01
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Alternative Title:Roughness analysis of grade breaks at intersections.
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Abstract:A method to analyze the roughness of grade breaks at highway intersections is proposed. Although there are a variety of instruments to physically measure the road roughness, there are no known methodologies to analyze profile roughness during the design stage. The proposed analytical procedure is based on a series of simulation experiments performed for six types of intersections. Various transition-curve parameters directly affecting roughness are identified. International Roughness Index (IRI) is used as the performance measure of a profile. The results of the experiments show that in addition to curve parameters, profile roughness is also affected by the elevation difference between the main highway and the intersecting secondary roadway. In general, the roughness is proportional to the elevation difference between the intersecting roadways.
Based on the results of the experiments, a computer based decision support system called SIDRA is developed to analyze an existing profile or to generate profiles with low roughness. Statistical analysis shows a close correlation between SIDRA generated results and field measured data. SIDRA produced values of IRI are also correlated with serviceability index (SI), a commonly accepted roughness measure.
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