This document discusses the process for route location and design of highways. It outlines three main steps: 1) Reconnaissance survey which evaluates feasibility of corridor routes based on terrain, traffic, land use and environmental/economic factors. 2) Preliminary location survey where horizontal and vertical alignments are determined while minimizing costs and impacts. 3) Final location survey which fixes the centerline and collects additional data for design and construction including cross-section leveling and infrastructure intersections. The overall aim is to locate the road in a way that results in the lowest construction, land, traffic and environmental costs.

1. Prepared by
Wry a Hade Nadir

2. Contents
 Introduction
 Steps in rout location
 Principle of highway location
 Reconnaissance survey
 Preliminary location survey
 Final location survey

3. 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

4. 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

5. 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

6. Reconnaissance survey
The 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)

7. Preliminary location Survey
Preliminary 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)

8. Final location survey
Fixed 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

9. Thank