Route Survey of Road and Pavement Design (Rehabilitation/Modernization)


Route Survey of Road and Pavement Design (Rehabilitation/Modernization)

Case Study: Road Linking Federal Secretariat Industrial Centre and Mass Communication Department (IMT Campus III), Enugu


The study cover a view and a detailed explanation of the modification required to be carried out on the main access road linkage of the Campus III Industrial center from federal Secretariat to Mass Communication Department of the Institution in order to update its services and functions.

The need for easing the flow of traffic on this access road shall rise, since it s a commercial center in the institution. It is required that the toad be revamped and generally upgraded. The existing road is no longer in peak condition and a result of traffic growth.

The study modification therefore involves the assessment of the roads present condition, involving carrying out side test, and surveys etc, as to what could be done and how best to enhance traffic flow.



General introduction

Design application

Aim and objective

Advantages of road

Reconnaissance survey

Route survey


Theodolite transversing of the road control

Importance of the overseeing

Equipment used on traversing


Conversion of angles to bearing (whole area bearing

Rectangular co-ordinate


Field leveling work general survey

Need for preliminary survey leveling work

Technical term used in leveling


Application of leveling

Instrument in leveling’

Operation condition’’

Leveling of the road

Reduction of filed data

Brief description on profile and cross sectional leveling

Uses of profile plot

Leveling tabulating

Earth work computation


Soil identification/laboratory test

Soil identification

Laboratory test performed in soil

Test to be carried out

Soil sampling

Sieve/particles size analysis

Aim and scope

Material and equipment

Test producers

Constancy limits

Liquid limit of soil

Objective and scope

Material and equipment

Test procedure

Plasticity index

Soil classification based in plasticity

Significance fo the study


Objective and scope

Materials and equipment

Test procedure

California bearing ratio (CBR)

Objective scope

Material and equipment

Test procedure

Borrow materials for sub-base

Laboratory test on the borrowed materials

CBR rating

Tabulation for mechanical analysis


Design vehicles

Design speed

Highway capacity

Deign guide

Design period

Basic design element horizontal alignment

Vertical alignment

Vertical curvature

Standard for grade

Co-ordination of vertical and horizontal alignment

Deign of curves

Pavement layers

Pavement design

Design facts the engineer should know for design


Pavement widening

Pavement material

Component pavement and their functions

Design of road pavement

Calculation of CBR value

Vertical and horizontal curve design

Design procedure

Services life of pavement

Drainage design

Basic policy on drainage design

Road side drainage channels

Erosion protection

Conclusion and recommendation




The importance of road to life and activities can not be overemphasized. Roads have important role to play in the transportation system of the country. Good transportation system through the pavement design has in the recent years provide to be of much significance commercially and otherwise history testifies that the provision of roadways is necessary to draw a country out of a state of un-civilization, but that civilization is not attained until good road network between neigbours is made so easy that the local difference which branch narrowness is minimized.

However this project has been designed strictly to modern design standards e.g ASSHO method and it centers on the route survey and pavement design of the road to meet with the present day effective services.

Moreover, this project work could really sever as a future guide in making a new rural road, down to industrial layout to connect mass comm..

Therefore being in a school environment a good transportation system will improve the healthy studying condition of the new road pavement and maintenance of the existing one.


The roadway linking Federal Secretariat industrial centre and Mass Communication Department is an earth road of about 0.620km in length whose origin can be traced back to the origin of the I.M.T campus III environment.

The project work has its relevance centered on the general design of a roadway which will link federal secretariat, industrial centre and Mass communication Department in order to ensure a hitch free traffic especially to the lecturer, visitors and students making use of that industrial centres

However the improvement of this roadway would grieve the students and lecturers the service of belonging as it gives easier access to mass com. Department.


This project site which is the roadway linking Federal Secretariat industrial centre and Mass Communication Department was inspected to ascertain its location and the present state of the road. It was vividly observed that the area was a dusty roadway throughout its length and had been graded without side rains, spanning about 620m length with the width of 85m.

To obtain these information, a preliminary survey was carried out which also helped to ascertain the geological and soil conditions likely intervals forming the chain ages to be referred to until the construction ids brought to a completion.


There are three types of roads in Nigeria

– Grade I: Surface dressed road

– Grade II: laterite on natural soil road

– Grade III: road on nature soil

Road, which were built earlier in Nigeria, were built as grade III roads, which consist of roads built on level earth. This grace of road was subsequently improved to grade II roads, which comprises of stone laterite on soil and on general surface roads.

Ultimately, the road was improved to grade I which is laterite road with good surfacing. The surfacing is either asphalted concrete for flexible pavement (in this project work flexible pavement will be considered).

The progressive method of road construction produced very durable roads but because of this rapid growth of traffic on the grade I and II this method of road construction was discontinued and surface dressed roads were built.

Road development receive a set back due to the development of railway in the country between 1895 and 1910 but was only revitalized early 1960when highways were built to connect various party of the country. Today, there is virtually on state capital (if not local government area headquarter) that is not linked directly by a highway.


In design of road, the current physical characteristics of vehicle in use and the anticipated future improvement in se are all essential. These vehicles are evaluated in terms f a standard vehicle known a design vehicle. The design data for a road stretch include: fix load, axle space, overall length, eight and width of the design vehicle.

  • Length: The length of the vehicle will affect the extra widening at curves and minimum turning radius the passing sight distance the road capacity and parking facilities for example 12m are recommended for a single unit truck while 20m (19:812m) for Troilus
  • Width: The width of the vehicle will affect the lane width the width of shoulders and the width of parking spaces. AASHO recommends a maximum width of 2.59m.
  • Height: The height of the vehicle will affect the overall height distance provided under structure such as: bridges, overhead bridges electric services lines etc. the maximum height for vehicle should not be more than 4m.
  • Weight: The weight of vehicles affects the thickness of the pavement, ruling and limiting gradient and design of bridges.
  • Speed: vehicle affects horizontal and vertical alignment design elevation limiting radius, signal distances, width of pavement on straight and curves for the purpose of this project a design speed of 30km/n is been considered. He design speed is the maximum speed maintainable throughout the journey with compatible safely and comfort)


A driver could be a vehicle rive, cyclist or pedestrian. There are no average drivers as the capabilities of a driver changes under such effects as fatigue ,frustration, monotony and alcohol. Much speed is the primary cause of accident.

Drivers have different visual perception capabilities to tract promptly to conditions requiring positive action

The major driver characteristics considered are:

Reaction Time: This is the period of time, which elapses from the period the eye of a driver registers a sene to the time muscular reaction occurs.

Perception Time: This is the period of the much elapses before reaction time begins. AASHO recommends combined reaction plus perception time to be 2.5 sec and can be taken as 3 sec in complex situations.


This is a quick type of surveyor rapid examination of the ground and its adjacent natural features usually made with out survey instruments to limit the alternate route in terms of cost tone or two.

In the cause of this project, the reconnaissance survey was carried out in order to obtain a first hand view of the road by walking through the length of the road thereby having a clear picture of the entire roadway. This is also helped in determining the most suitable way of carrying out the project economically in time and energy. During the process of reconnaissance, survey stations were chosen and marked.


The method adopted in marking linear measurement is the linear measurement in which a employed in making a direct measurement is dependent of the degree of accuracy required. However in cause of this project, accuracy in measurement was maintained to a moderate level. Obstacle such as rough ground, pedestrian traffic and motor cycle traffic were avoided as much as possible.


The survey stations were marked in such way that will fulfill the following requirement.

a. The stations where to be easily and quickly found during survey operations.

b. They were to be fairly permanent so that pedestrians will not easily remove them.

c. They were marked using bottle tops and nails at the center line of the road for easy location of these stations, temporary stations were established at the edge of the road using wooden pegs.


These factors include the following

Easy meaning condition: stations are to be chosen in such a way as to avoid obstructs during draining or tapping exercise.

Inter-visibility: stations are to be chosen and placed in such a manner that no station on struts the line of sight of another stations. This was considered for both traversing and leveling.

3. Traversing at close distance should be avoided in order to avoid angular errors being introduced if targets at short range are not properly bisected.

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