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Design Of Road Pavements Designing Of Road Pavement Linking Federal Secretariat Industrial Centre
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1.4 MOTOR VEHICLE CHARACTERISTICS THAT AFFECT ROAD DESIGN DATA
In
design of road, the current physical characteristics of ehicle 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: aix load, axle
space, overall length, eight and width of the design vehicle.
1.
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
2. 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.
3.
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.
4. Weight: The weight of vehicles affects the thickness of the pavement, ruling and limiting gradient and design of bridges.
5.
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)
1.5 DRIVER AND THEIR CHARACTERISTICS
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:
1.
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.
2. perception time: this is the period of the much
elapses before reaction time begins. AASHO recommends combined reaction
plus perception time tobe2.5 sec and can be taken as 3 sec in complex
situations.
1.6 RECONNAISSANCE SURVEY
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,
there 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.
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ABSRACT - [ Total Page(s): 1 ]This thesis on a project undertaken by the author is aimed at providing explanation of the basic theory of the work of road design and its associated activities also, to cover practical methods of working.In pursuit of the meaningful completion this project a lot of investigation was embarked with principles and practice of road construction. The total distance of route was determined and stations established bearing in mind the intervisibility of the stations.Leveling was carried out to obtain ... Continue reading---
