What is the purpose of highway route selection?

What is the purpose of highway route selection?

Two of the most important considerations in selecting the route for a proposed highway are 1) the physical features of the area and 2) how these features relate to the geometric design controls. Physical features that affect route selection include topography, ground (soil) conditions, and surrounding land use.

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 the 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 are the main objectives in selecting particular location for 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 a route selection?

Crucial to the proper ability of hosts to exchange IP packets is the correct selection of a route to the destination. Routes can be chosen and prioritized based on other packet characteristics. …

What is the meaning of route selection?

Route assignment, route choice, or traffic assignment concerns the selection of routes (alternative called paths) between origins and destinations in transportation networks. It is the fourth step in the conventional transportation forecasting model, following Trip Generation, Destination Choice, and Mode Choice.

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.

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 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 functions which control the selection of alignment?

Factors controlling the Highway alignment:

• Obligatory Points: The control points governing highway alignment are called obligatory points.
• Horizontal Curve and gradient:
• The volume of traffic:
• Type of Traffic:
• Earthwork and backfilling:
• Railway Crossing:
• Radius of the Horizontal Curve:
• Bridges:

What are the steps in the route selection?

As far as decision making is concerned for new roads, there are essentially three steps: 1) selection of the corridor within which routes are selected 2) identification of a minimum of three route options 3) selection of the preferred route option.

What are the factors affecting the alignment of a highway?

(c) Geometric design: Geometric design factors such as gradient, radius of curve, sight distance etc. also govern the alignment of the highway. To keep the radius of curve minimum, it may be required to change the alignment.

How do you select a route for a highway?

Route Selection and Alignment. Two of the most important considerations in selecting the route for a proposed highway are 1) the physical features of the area and 2) how these features relate to the geometric design controls. Physical features that affect route selection include topography, ground (soil) conditions, and surrounding land use.

What are the factors that affect route selection?

Physical features that affect route selection include topography, ground (soil) conditions, and surrounding land use. Any possible environmental impacts posed by construction of a new highway must also be considered.

What does a highway designer look for?

First, the highway designer reviews topographic, geologic and soil maps as well as available aerial photographs of the area. The designer looks for conditions that will require sudden changes in alignment. For example, areas that would necessitate connecting long straight sections with sharp curves should be avoided.