Prepared by

Wry a Hade Nadir

Contents Introduction

Steps in rout location

Principle of highway location

Reconnaissance survey

Preliminary location survey

Final location survey

Introduction

Alignment :-The position or the layout of the central line of the highway.

– Horizontal alignment includes straight and curved paths.– Vertical alignment includes curves and gradients.

The aim of alignment selection process is to find a location for the new road that will result in the lowest total construction, land, traffic and environmental costs

.

Steps in Route location Location of proposed highway is an important first step

in its design and the steps as follow:

1- known the termini point

2-identify and locate

3-reconnaissance survey

4-draw a corridor

5-possible center line

6-examine each of the alternative alignment

7-final design

Principle of highway location

There are there difference faces for the location of a highway

1-Reconnaissane survey

2-preliminary location survey

3-final location survey

Reconnaissance surveyThe purpose of the reconnaissance survey is to evaluate the feasibility of one or more corridor routes for a

highway between specific points that may be many kilometers away and can taking in to account the following:

1-topography,geology,climate,and traffic volume

2-social and demographic , land use

3-environment al

4- economic(unit cost for construction and trends of agricultural, commercial industrial activity)

Preliminary location SurveyPreliminary horizontal and vertical alignment determined and all feasible routes are evaluated for:

1-Minimize the instruction cost

2-Minimize the impact on the Environment

3-Function of term Safety

4-maximise of the economic investment(cost/benefit)

Final location surveyFixed the center line of the selected alignment and

collect additional data for the design and preparation

of working drawings:

Pegging the centre line

Centre-line Leveling

Cross-section Leveling:

Intersecting Roads

Ditches and Streams

Thank

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