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oa Civil Engineer in South Africa - Potensiele gevaar van paaie teen hellings : technical paper

 

Abstract

Die minimum straal van horisontale boe en die maksimum kromming van vertikale boe kan bereken word volgens riglyne vir die geometriese ontwerp van paaie en strate. Sigafstand moet deurgaans groter wees as die stopafstand wat benodig word om 'n voertuig tot stilstand te bring. Huidige riglyne pas die stopafstand op 'n horisontalepad toe vir die bepaling van stopsigafstand, wat tot 'n onderskatting van die vereiste radius en booglengte teen afdraandes aanleiding gee. Die artikel stel 'n metode voor waarvolgens die stopafstand op 'n spesifieke helling tydens padontwerp in ag geneem kan word.

Guidelines for the geometric design of highways and streets are used to calculate minimum radii for horizontal curves and maximum curvature for vertical curves. Sight distance should always be greater than the stopping distance of vehicles. Current guidelines apply the stopping distance on a horizontal road to determine stopping sight distance, which results in an underestimation of the required radius or curve length on downgrades. A procedure is proposed that allows the engineer to take stopping distance on specific grades into account in road design.

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/content/civeng1/32/8/EJC25104
1990-08-01
2016-12-06
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