Design And Construction Of An Electronic Traffic Controller At A Major T-Junction

Project and Seminar Material For Electrical Electronics Engineering EEE

Project and Seminar Material For Electrical Electronics Engineering EEE


Traffic lights are integral part of modern life. Their proper operation can spell the difference between smooth flowing traffic and traffic Jam. Proper operation entails precise timing, cycling through the states correctly, and responding to aside input, like walk signals. The purpose of this project is to design and construct an electronic traffic controller for a major T-junction. Chapter one deals with introduction and definition of terms while chapter two is the Literature review. Components description and usage is on chapter three, principles of operation in chapter 4 summary and recommendation are in chapter five

Table Of Contents

Preliminary Page(s)

  • Title page
  • Certification
  • Dedication
  • Acknowledgment
  • Abstract
  • Table of content

Chapter One

  • 1.0 Introduction
  • 1.1 Benefits of traffic controller
  • 1.2 Types of traffic signal components and operation

Chapter Two

  • 2.0 literature review

Chapter Three

  • 3.0 Components Description and usage

Chapter Four

  • 4.0 Operational principle of an electronics traffic controller
  • 4.1 The Rectifying circuit
  • 4.2 The microprocessor circuit
  • 4.3 The relay circuit
  • 4.4 software program analysis

Chapter Five

  • 5.0 conclusion/summary
  • 5.1 Recommendation
  • References

Chapter One

1.0 Introduction

A traffic light system is an electronic device that assigns right of way at an intersection or crossing or street crossing by means of displaying the standard red, yellow and green colored indications. In addition, it works in conjunction with pedestrian displays to assign pedestrian crossing right of way. A traffic light, also known as a traffic signal, stop light, stop-and-go light is a signaling device positioned at intersection, pedestrian crossing or other location in order to indicate when it is safe to drive, ride, or walk using a universal colour code (and a precise sequence, for that are colours blind).

Nowadays, a red light meant traffic in all directions had to stop. A yellow light means crossing traffic would have to slow and a Green light would have to go or proceed.

There are different ways of controlling intersections. In the simplest cases the right-hand-rule or if the traffic is higher, a roundabout or the signal of a Police man can help steer the traffic. However, especially in big cities, in the complicated cases when the roads in the intersection have several lanes, the use of traffic lights cannot be avoided. An addition of issue arises when in the intersection not only roads but also railway tracks take part, what often occurs in suburban traffic situations. The most common way to handle this type of intersection is the conventional cyclic light control.

There are two parts that are involved in accomplishing this construction of an electronic traffic controller โ€“ the software part and the hardware part. The software deals with the programming aspect of the circuit that controls the hardware while the hardware deals with the physical aspect of the circuit (components).

1.1 Benefits Of Traffic Controller

When properly used, traffic control signals are important devices for the control of vehicle in road they assign the right-of way to a choice of traffic movements and thereby deeply influence traffic flow. Traffic control signals that are properly designed, located, operated, and maintained will have one or more of the following advantages:

  1. Provide orderly movement of traffic
  2. Minimized competing movement.
  3. Coordinated for continuous movement.
  4. Provider confidence by assigning right way.

Traffic control signals are often considered a cure for all traffic problems at intersections. This belief has led to traffic control signals being installed at many locations where they are needed, adversely affecting the safety and efficiency of vehicular, bicycle and justified by traffic and road way condition, can be ill-designed, ineffectively placed, improperly operated, or poorly maintained.

While traffic signals can help in locations where they are justified and installed properly, they also have disadvantages. There will always be some disadvantages even if the signal is justified. One of the disadvantages is that an electronic traffic controller does not obey emergency situations.

1.2 Types Of Traffic Signal Components And Operation

Traffic signals have the following components or parts:

  1. Main display with red, yellow and green lights.
  2. Traffic signal cabinet containing the traffic signal controller.
  3. Inductive loops or sensor.

In many cities, traffic signals mainly operate in three modes:-

(a) Fixed-Time Mode:

Under this mode, there are no detections for any approach, the continuously cycles regardless of actual traffic demand.

Pedestrian walk signals are automatic and will cycle concurrently with the vehicular signal indicator

(b) Semi โ€“ Activated Mode:

Under this mode, the detection system is presented only on a minor cross street. When detection is activated, the green light is on a minor cross street. When detection is activated, the green light on a major street is interrupted to allow the minor street traffic and pedestrian to safety enter the intersection.

Pedestrian walks signals for crossing a minor street are not. Pedestrian crossing a major street must push the โ€œpedestrian push buttonโ€ to get the walk signals.

(c) Actuated Mode:

Under this mode, there are electronics for all approaches. The traffic signal set to provide the green light โ€œOn โ€“ demandโ€ or only in the presence of vehicles.

Chapter Five

5.0 Conclusion / Summary

Traffic control system has solved the problem of accident and traffic jams on our roads. The type of system used is determined by the level of development of technology in that country. In advanced country, the semi and Actuated mode are used while in developing countries, the fixed mode is used.

The use of traffic control system has reduced the numbers of traffic men (policemen) on our major roads intersections. Also it has helped in the tracking down of traffic defaulters in major intersections because of the security cameras that are normally installed along with the traffic control system.

5.1 Recommendations

With Nigeria as a case study we make the following recommendations:-

  1. Nigeria should try to enhance the semi and actuated mode traffic control systems because the fixed mode system does not work on principle of demanded and waste time.
  2. Traffic control systems should be installed in all the major junctions.
  3. Awareness/campaign should be carried out to sensitize Nigerians on the important of traffic control system to their safety, the need to obey traffic laws and protect traffic control systems in various junctions.

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