Public Roads, Vol. 6

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Excerpt from Public Roads, Vol. 6: A Journal of Highway Research, March 1925-February 1926It is '=found that traffic moving on the outside of the curve shifts its course farther in the direction of the inside than the traffic moving in the Opposite direction, which is limited in its choice of a course by the proximity of the pavement edge. It follows, therefore, that unless the pavement is widened on the curves the normal tangent clearance between the two lines of vehicles will be reduced. The behavior of the traffic on the curves is in¿uenced, however, by the presence or absence of traffic center lines, the amount of superelevation and whether the super elevated section has a plane or crowned surface, the condition of the shoulders and roadsides, the presence or absence of roadside structures such as guardrails, culvert head walls, etc., either on the inside or outside of the curve, and the degree of curvature and tangent width of the pavement. The observations shows that traffic center lines do aecom lish the separation of the traffic, and they apparent y show that a crowned section, even though superelevated, has the effect of causing the traffic to seek the favorable slope on theinside of the curve. But because of the presence of complicating factors the relation between the degree of curvature and the tangent width of the pavement and the amount of widening required onthe curve is not revealed.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.