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2024年4月16日发(作者：scalar使用方法)

外文文献翻译

(含：英文原文及中文译文)

文献出处：Y Hassan. Geometric Design of Highways[J] Advances in

Transportation Studies, 2016, 6(1):31-41.

英文原文

Geometric Design of Highways

Y Hassan

A. Alignment Design

The alignment of a road is shown on the plane view and is a series of

straight lines called tangents connected by circular curves. In modern

practice it is common to interpose transition or spiral curves between

tangents and circular curves.

The line shape should be continuous, sudden changes from flat line to

small radius curve or sudden change of long line end connected to small

radius curve should be avoided, otherwise a traffic accident may occur.

Similarly, arcs with different radii end-to-end (complex curves) or short

straight lines between two arcs with different radii are bad lines unless an

easing curve is inserted between arcs. The long, smooth curve is always a

good line because it is beautifully lined and will not be abandoned in the

future. However, it is not ideal that the two-way road line shape is

composed entirely of curves, because some drivers always hesitate to pass

through curved road segments. The long and slow curve is used in the

smaller corners. If you use a short curve, you will see "kinks." In addition,

the design of the flat and vertical sections of the line should be considered

comprehensively and should not be only one. No matter which, for

example, when the starting point of the flat curve is near the vertex of the

vertical curve, serious traffic accidents will occur.

Vehicles driving on curved sections are subjected to centrifugal force, and

they need a force of the same magnitude in the opposite direction due to

the height and lateral friction to offset it. From the viewpoint of highway

design, the high or horizontal friction cannot exceed a certain value. The

maximum, these control values for a certain design speed may limit the

curvature of the curve. In general, the curvature of a circular curve is

represented by its radius. For the linear design, the curvature is often

described by the curvature, ie, the central angle corresponding to the

100-foot curve, which is inversely proportional to the radius of the curve.

A normal road arch is set in a straight section of the road, and the curve

section is set to a super high, and an excessively gradual road section

must be set between the normal section and the super high section. The

usual practice is to maintain the design elevation of each midline of the

road unchanged. By raising the outer edge and lowering the inner edge to

form a super high, for the line shape where the straight line is directly

connected with the circle curve, the super high should never start on the

straight line before reaching the curve. At the other end of the curve at a


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