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• W641912354 abstract "The purpose of this study was to review road geometric standards (which are currently based on passenger car characteristics) taking into account truck driver eye-height and braking distance. A survey of truck driver eye-height gave a 5th percentile height of 1.87 m. Owing to the lack of empirical data on the braking performance of trucks, a theoretical approach was used to estimate design braking distances on the basis of the maximum legal braking distances of South African trucks. In addition, two American surveys provided further data on truck braking distances. A comparison between the speeds of cars and trucks in 1981 and 1982 on Transvaal freeways gave a consistent 17 km/h difference between similar percentiles. It was thus possible to compare the elements of road geometric design based on stopping sight distance for passenger cars travelling at a given speed and trucks travelling at a 17 km/h lower speed. It was found that, at design speeds above 100 km/h, the current standards for stopping sight distance, k-values for sag vertical curves and lateral clearance on horizontal curves were insufficient for trucks. Revised values for design speeds above 100 km/h, termed recommended values, are proposed for use until South African truck braking distances are known. (Author/TRRL)" @default.
• W641912354 created "2016-06-24" @default.
• W641912354 creator A5001900296 @default.
• W641912354 date "1983-03-01" @default.
• W641912354 modified "2023-09-27" @default.
• W641912354 title "A NEED FOR REVISED GEOMETRIC STANDARDS BASED ON TRUCK STOPPING SIGHT DISTANCE AND DRIVER EYE-HEIGHT" @default.
• W641912354 hasPublicationYear "1983" @default.
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