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- W650057037 abstract "Consistency analysis of geometric design is a useful tool to evaluate safety in roads. Nevertheless only a few geometrical design standards include recommendations for assessing consistency in horizontal alignment. For horizontal reverse curves (or s-shaped curves), Chilean and Spanish standards establish that if tangent length is lower than 400m, operating speeds on both curves are correlated, and an entrance/exit radius ratio is recommended for a good design. Nevertheless the relationship among operation speed, tangent length, and acceleration rates are not considered in the consistency analysis. In this paper the consistency in reverse curves design, considering different radius ratio, design speeds, tangent lengths and accelerations is analyzed and the criterion used in Chile is verified. Three scenarios with 350 combinations of geometric designs were simulated. Simulation techniques were used for each case, by using acceleration values of 0.4m/s2 and 0.85.m/s2 estimated in Chile and in United States, respectively. It was concluded that the condition of tangent length of 400m used in the Chilean standard is not enough to ensure correlation between speeds on curves and a consistent design. The consistency is dependent on the combination of radius values, tangent length, design speed and acceleration rates used." @default.
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- W650057037 date "2011-01-01" @default.
- W650057037 modified "2023-09-24" @default.
- W650057037 title "Consistency analysis in horizontal reverse curves" @default.
- W650057037 hasPublicationYear "2011" @default.
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