Highway Geometric Design
The geometrics of highway should be designed to provide optimum efficiency in traffic operation with maximum safety at resonable cost. The designer may be exposed to either planning of new highway net work or improvement of existing highways to meet the requirements of the existing and the anticipated traffic.
Geometric design of highways deals witj the following elements:
(i) Cross section elements
(ii) Sight distance considerations
(iii) Horizontal and vertical alignment details
(iv) Intersection elements
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Under cross section elements, the consideration for the width of pavement, formation and land, the surface characteristics and cross slope of pavement are included. The sight distance or clear distance visible ahead of a driver at horizontal and vertical curves and at intersections govern the safe movements of vehicles.
The change in the road directions are made possible by introducing horizontal curves. Superelevation is provided by raising the outer edge of pavement to counteract the centrifugal force developed on a vehicle traversing a horizontal curve; extra pavement width is also provided on horizontal curves. In order to introduce the centrifugal force and the superelevation gradually, transition curves are introduced between the straight annd circular curves. The gradients and vertical alignment of a highway.
Highway geometrics are greatly influenced by the topography, locality and traffic characteristics and the requirements. The factors which conrol the geometric design requirements are speed, road user and vehicular characteristics, design traffic, traffic capacity and benefit cost considerations.
Highway and Transport Engineering
and this section is about Highway Geometric Design
(refference : Khanna, S.K., Justo, C.E.G., Highway Engineering, 3th edition, Nem Chand & Bros Roorkee (U.P.), 1976.)
Under cross section elements, the consideration for the width of pavement, formation and land, the surface characteristics and cross slope of pavement are included. The sight distance or clear distance visible ahead of a driver at horizontal and vertical curves and at intersections govern the safe movements of vehicles.
The change in the road directions are made possible by introducing horizontal curves. Superelevation is provided by raising the outer edge of pavement to counteract the centrifugal force developed on a vehicle traversing a horizontal curve; extra pavement width is also provided on horizontal curves. In order to introduce the centrifugal force and the superelevation gradually, transition curves are introduced between the straight annd circular curves. The gradients and vertical alignment of a highway.
Highway geometrics are greatly influenced by the topography, locality and traffic characteristics and the requirements. The factors which conrol the geometric design requirements are speed, road user and vehicular characteristics, design traffic, traffic capacity and benefit cost considerations.
Highway and Transport Engineering
and this section is about Highway Geometric Design
(refference : Khanna, S.K., Justo, C.E.G., Highway Engineering, 3th edition, Nem Chand & Bros Roorkee (U.P.), 1976.)
Title Post: Highway Geometric Design
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