This project work is on design and construction of a 3-way traffic lighting system. A 3-way Traffic light is signaling device positioned at 3-way road intersections, pedestrian crossings and other locations to control competing flows of traffic. The road construction safety traffic light system is designed to replace a manual traffic control on a road construction sites. This device can replace one or both flaggers during the two lane closures on the event of a road construction. The road construction safety traffic light system is considered one of the best devices in work zone traffic flow control systems. The device is a portable traffic light unit which can be best utilized in controlling traffic flow in a road construction site for long term or short term lane closures and to control two-way traffic in a single lane. By implementing new technologies in automating traffic flow in road construction site could possibly eliminate the usage of a conventional flagman at all times. The road construction safety traffic light system is a practical solution to solve problems which contribute towards hazards at road construction site and to be inline with the road safety regulation which is taken into granted by the contractors. The automated portable traffic light system can reduce direct costs in man power utilization and increase safety for the road users and construction workers by eliminating the need for a human flagmen. This system is applicable for public and privately funded road construction projects that require overnight or 24-hour traffic control as well as in different weather conditions.
The purpose of this project work is to design and construction a 3-way traffic light device that can be used to control the flow of traffic at 3-way road intersection.

TABLE OF CONTENTS
COVER PAGE
TITLE PAGE
APPROVAL PAGE
DEDICATION
ACKNOWELDGEMENT
ABSTRACT
CHAPTER ONE
INTRODUCTION
1.1      GENERAL DESCRIPTION OF THE PROJECT

1. OBJECTIVE OF THE PROJECT
2. PURPOSE OF THE PROJECT
3. SIGNIFICANCE OF THE PROJECT
4. PROBLEM AND LIMITATION OF THE PROJECT
5. SCOPE OF THE PROJECT
6. PROJECT ORGANISATION

CHAPTER TWO
LITERATURE REVIEW

1. HISTORICAL BACKGROUND OF THE PROJECT
2. REVIEW OF THREE-WAY JUNCTION
3. TRAFFIC LIGHT MOUNTING
4. TYPES OF TRAFFIC LIGHT

CHAPTER THREE
SYSTEM DESIGN

1. DESCRIPTION OF THE SYSTEM BUILDING BLOCK
2. SYSTEM DESIGN SPECIFICATION
3. BLOCK DIAGRAM OF THE SYSTEM
4. DESCRIPTION OF THE OVERALL OPERATION OF THE SYSTEM
5. LIST AND DESCRIPTION OF THE SYSTEM COMPONENTS
6. COMPLETE CIRCUIT DIAGRAM OF A THREE WAY TRAFFIC LIGHT CONTROL

CHAPTER FOUR

1. IMPLEMENTATION, TESTING AND RESULTS
2. CONSTRUCTION PROCEDURE AND TESTING
3. INSTALLATION OF THE COMPLET DESIGN 
4. CASING AND PACKAGING
5. ASSEMBLING OF SECTIONS
6. TESTING OF SYSTEM OPERATION
7. PROBLEM ENCOUNTERED

CHAPTER FIVE

1. COST OF ANALYSIS, CONCLUSION AND RECOMMENDATION

REFERENCES

 

 

 

CHAPTER ONE
1.1                                                        INTRODUCTION
The trend in electronics is tending into digital electronics which make it possible for the birth of computers, digital communication systems like GSM, and industrial automation.
This is the main reason why we have chosen a project topic on the design and construction of an automatic three way (3-way) traffic light control.
This system has always been right from the advent of digital electronics in Nigeria.
Our own project design is the miniature type that employs six (9) light emitting diodes (LED) as the visual display unit (VDU).
The entire system contains four (4) different plus the block that contains the light omitting diodes which makes it five (5) blocks altogether and also a power supply unit (PSU) that supplies the battery voltage.
At the input is an astable multivibrator (AMV) built using 555 timer that provides the intelligence clock signal that determines the timing based on what the time sequence generator interprets from the clock (10 ten decade counter).  Then the binary corded decimal (BCD) output is now ored using discret junction diodes as OR gate such that an output is adapted using the functional behaviour of OR-gate into an inter-fase card that contains arrays of transistor switching circuit that switches the six (9) LEDS based on the timing sequencing such that three (3) LEDs for one lane, the other three (6) goes for the other two lane, which gives vehicles passing from one lane to another lane traffic signal so as to avoid accidents.

1.2                                                      DESIGN OBJECTIVE
The objective of this design is to create an electronic circuit using digital components and a few linear components such that a digital output is raised to control the traffic at T or Y junction using six (9) lamps rather light emitting diodes LEDS, where three (3) lamps or LEDs serves for one lane and t he other three (6) serves for the other two lane, Among the three (3) LEDs one is Red, which signifies that vehicles should move. The second is green and it signifies that vehicles should stop. The third as amber which signifies vehicles should get ready to move.
1.3                                         SIGNIFICANCE OF THE PROJECT
The project design work signifies a lot in modern industrial electronics. This design that replaced the manually used agent which is the traffic warden positioned at different traffic junctions. In most developed towns in Nigeria, this system is employed at every T-junction, so that traffic jam or hold up will be highly controlled and also accidents at this junction are highly minimized. In advance countries, the type of traffic light employed are inform of robot whose eyes serves as the visual display unit (VDU) when the traffic rule is violated the error detector is effected by the mechanical action of the robot.
Signals offer maximum control at intersections. They relay messages of both what to do and what not to do. The primary function of any traffic signal is to assign right-of-way to conflicting movements of traffic at an intersection. This is done by permitting conflicting streams of traffic to share the same intersection by means of time separation. By alternately assigning right of way to various traffic movements, signals provide for the orderly movement of conflicting flows. They may interrupt extremely heavy flows to permit the crossing of minor movements that could not otherwise move safely through an intersection.
When properly timed, a traffic signal increases the traffic handling capacity of an intersection, and when installed under conditions that justify its use, a signal is a valuable device for improving the safety and efficiency of both pedestrian and vehicular traffic. In particular, signals may reduce certain types of accidents, most notably, right-angle (broadside) collisions.

1.4                                                 SCOPE OF THE PROJECT
The entire system was built using an electronic circuit using digital components and a few linear components such that a digital output is raised to control the traffic at T or Y junction using six (9) lamps rather light emitting diodes LEDS, where three (3) lamps or LEDs serves for one lane and t he other three (6) serves for the other two lane.At the input is an astable multivibrator (AMV) built using 555 timer that provides the intelligence clock signal that determines the timing based on what the time sequence generator interprets from the clock (10 ten decade counter).  Then the binary corded decimal (BCD) output is now ored using discret junction diodes as OR gate such that an output is adapted using the functional behaviour of OR-gate into an inter-fase card that contains arrays of transistor switching circuit that switches the six (9) LEDS based on the timing sequencing such that three (3) LEDs for one lane, the other three (6) goes for the other two lane, which gives vehicles passing from one lane to another lane traffic signal so as to avoid accidents.
This traffic light is made with the help of counter IC, which is mainly used for Sequential Circuits. We can also call it as Sequential Traffic Lights. Sequential Circuits are used to count the numbers in the series.

Coming to the working principle of Traffic Lights, the main IC is 4017 counter IC which is used to glow the Red, yellow and green LED respectively. 555 timer acts as a pulse generator providing an input to the 4017 counter IC. Timing of glow of certain lights totally depends upon the 555 timer’s pulse, which we can control via the Potentiometer so if you want to change the time of glow, you can do so by varying the potentiometer, having the responsibility for the timing. 

 

1.5                            PROBLEM AND LIMITATION OF THE PROJECT

Traffic lights were designed to organize the way in which people and cars utilize an intersection, reducing accidents and encouraging the flow of traffic. However, many problems have been found in the traffic light system, from decreasing one type of accident while significantly increasing another to adding traffic to residential streets viz:

Increase in Accidents

Traffic lights can “significantly increase” the number or rear-end collisions at an intersection. Rear-end collisions occur when one car stops and the vehicle behind him does not, colliding into the stopped car. The traffic signal works correctly for the car that actually stopped at the intersection. However, the second car either fails to recognize the stopped car or fails to stop at an appropriate distance to avoid the collision.

Delay

Traffic lights ensure vehicles proceed through the intersection in an orderly fashion. Before traffic lights, however, there was typically one street (out of the two that make up an intersection) that dominated. Once traffic lights were installed, the dominant street began to share equal time with its cross street. As a result, many areas began to experience congestion on one street during hours of heavy traffic, making traffic delays another disadvantage of traffic lights.

Diverted Congestion

To avoid congestion, drivers will use alternative routes, usually residential streets. This is another disadvantage of traffic lights. As drivers cut through residential areas to avoid the congested stoplight, the congestion on those streets increases, especially when intersections are regulated by a yield or two-way stop sign. The overload causes premature wear on residential streets and inconveniences residents of the area.

Civil Disobedience

Frustration with traffic lights is already high among drivers during hours of heavy congestion. Thus, a malfunctioning traffic light or one that stays on red for a few seconds longer than usual can often inflame drivers. The result is an increase in accidents from cars moving when the traffic light signals them to stop.

1.6                                              PURPOSE OF THE PROJECT
The primary purpose of the traffic light is to attain the safest and most efficient overall traffic flow possible. When properly timed, a traffic signal increases the traffic handling capacity of an intersection, and when installed under conditions that justify its use, a signal is a valuable device for improving the safety and efficiency of both pedestrian and vehicular traffic. In particular, signals may reduce certain types of accidents, most notably, right-angle (broadside) collisions.

1.7                                        PROJECT WORK ORGANISATION
The various stages involved in the development of this project have been properly put into five chapters to enhance comprehensive and concise reading. In this project thesis, the project is organized sequentially as follows:
Chapter one of this work is on the introduction to a 3-way traffic lighting system. In this chapter, the background, significance, objective limitation and problem of a 3-way traffic lighting system were discussed.
Chapter two is on literature review of a 3-way traffic lighting system. In this chapter, all the literature pertaining to this work was reviewed.
Chapter three is on design methodology. In this chapter all the method involved during the design and construction were discussed.
Chapter four is on testing analysis. All testing that result accurate functionality was analyzed.
Chapter five is on conclusion, recommendation and references.

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