Citation

ten Brummelaar T. Aust. Road Res. 1983; 13(2): 123-134.

Affiliation

Univ of New South Wales, Sch of Civil Engineering, Kensington, NSW, Aust

Copyright

(Copyright © 1983, Australian Road Research Board ARRB)

DOI

unavailable

PMID

unavailable

Abstract

Using perspective pictures of roads - drawn by the Tangent Method - the reversal point curve on road curves is defined. The position of the reversal point curve is indicated and it is shown that the reversal points on the road edge and shoulder lines do not lie at the same distance below the horizon. An optical illusion could result, which is further influenced by the existence of walls in cuttings. The steep wall on the inside of curves tends to enforce the impression of adverse crossfall. The roundness or pointiness of the reversal curve is discussed as a clue to the curvature of the curve approached by the driver. The form of the reversal curve is not dependent on the total deflection of the road curve, but on the radius of the curve and the road width.