Questions of perfection of road desing
Abstract
Questions of perfection of road desing
Incoming article date: 09.04.2018Article is devoted questions of road design taking into account its visual smoothness. In article questions of influence of visual smoothness on the providing by it of velocity of movement of vehicles are considered. In article the developed practice of roads design is analyzed. The given practice, in a due measure, does not consider requirements of landscape designing. Which, in turn, though are registered in the arch of rules, but have recommendatory character. Also in article questions of use of the minimum parameters of highways are mentioned at its designing. The necessary increase in the minimum parametres of norms of designing for maintenance of movement of vehicles with settlement speeds is recommended. The special attention in article is given transitive curves as their use at observance of principles of coordination of elements of the plan and a longitudinal profile provides visual smoothness and clearness of a line of a highway. It in turn raises traffic safety on these lines. The considerable attention is given the analysis of technical and psychological safety, as to the reasons of emergencies on roads. In article raising factors of values of radiuses for achievement of psychological comfort by the driver are offered at passage of curves to the plan.
Keywords: Road line, longitudinal profile, visual smoothness, landscape designing, radius of a horizontal curve, spiral curve, safety of traffic