What do you mean by highway alignment?

Highway Alignment is the position or layout of centre line of the highway on the ground is called the alignment. it includes straight path, horizontal deviation and curves. Keywords: Highway alignment, longitudinal sectioning, cross sectioning, earthwork calculations.

What is highway alignment and its requirements?

It should have a shortest path. The alignment must be easy to construct and maintain and also it should be easy for vehicle operation. It should be safe in case of designing the horizontal and vertical curves. The alignment should be selected in such a way that it is economical during construction.

What is highway alignment and surveys?

After map study, engineering or field survey are carried out to finalize the highway alignment. The object of these surveys is to locate the alignment of a road which provides maximum transportation facilities with the minimum cost of construction and maintenance.

What are the factors influencing highway alignment?

Factors Affecting Alignment of Road :

• Need of traffic.
• Purpose and class of road.
• Obligatory points.
• Curve.
• Gradient.
• Sight distance.
• Number of drainage crossing.
• Railway and river crossing.

What are the objectives of highway alignment?

The highway alignment optimization considers minimization of land acquisition cost, earthwork cost, pavement construction cost, travel-time cost, vehicle operation cost and accident cost as the objective.

What is requirement of alignment?

The requirements of an ideal alignment are: The alignment between two terminal stations should be short and as far as possible be straight, but due to some practical considerations deviations may be needed. The alignment should be easy to construct and maintain. It should be easy for the operation of vehicles.

What is the basic requirement of alignment?

Explanation: the alignment of the road should be short, safe, easy and economical for users and engineers.

Which is the basic requirement of alignment?

Short. Easy.

What are the basic requirements of an ideal alignment of the highway?

Short – it is desirable to have short alignment between two terminal station .

What determines highway location?

The basic principle for locating highways is that roadway elements such as curvature and grade must blend with each other to produce a system that provides for the easy flow of traffic at the design capacity, while meeting design criteria and safety standards.

What are the basis requirement of good alignment?

Which is the direction of rolling in highway construction?

In highway construction rolling starts from sides and proceeds to center. For the construction of water bound macadam roads, the correct sequence of operations after spreading coarse aggregates is dry rolling, application of screening, wet rolling and application of filler.

What is a survey alignment on a highway?

Highway Alignment and Survey. Alignment. The position or the layout of the central line of the highway on the ground is called the alignment. Horizontal alignment includes straight and curved paths. Vertical alignment includes level and gradients.

What is vertical alignment in road construction?

Vertical Alignment: This arrangement with the inclinations, slopes and leveling of the ground. Viewpoint view or front view or side perspective on the road alignment causes you to comprehend about Vertical alignment. Significance of Highway Alignment: Choosing the highway alignment is the most essential piece of road construction.

What are obligatory points in highway alignment?

The control points governing highway alignment are called obligatory points. These points decide where the alignment should pass and where the alignment should not pass. Roads are constructed for the development of the areas. A small deviation in alignment can be acceptable if highway passes through the towns, villages, cities etc.

How to cross a rail Lane in road alignment?

Road alignment should cross a rail lane ideally at 90Degrees. For fast-moving lanes or national highways or expressways, it is advisable to construct the bridge over rail lane to avoid the traffic jams. 7. Radius of the Horizontal Curve: