PPT - Basics Of Signal Designing Civil Engineering (CE) Notes | EduRev

Traffic Engineering and Management

Civil Engineering (CE) : PPT - Basics Of Signal Designing Civil Engineering (CE) Notes | EduRev

 Page 2


?Introduction
?Definition and Notations
?Design Procedure
?Fixed Time Signals
?Advantages 
?Disadvantages
?Determination Cycle length
? Saturation flow
?Problem
?Conclusion
Page 3


?Introduction
?Definition and Notations
?Design Procedure
?Fixed Time Signals
?Advantages 
?Disadvantages
?Determination Cycle length
? Saturation flow
?Problem
?Conclusion
? Traffic signals are one of the most effective and flexible
active control of traffic and is widely used in several
cities world wide.
? The conflicts arising from movements of traffic in
different directions is addressed by time sharing
principle.
Page 4


?Introduction
?Definition and Notations
?Design Procedure
?Fixed Time Signals
?Advantages 
?Disadvantages
?Determination Cycle length
? Saturation flow
?Problem
?Conclusion
? Traffic signals are one of the most effective and flexible
active control of traffic and is widely used in several
cities world wide.
? The conflicts arising from movements of traffic in
different directions is addressed by time sharing
principle.
? Cycle: A signal cycle is one complete rotation 
through all of the indications provided.
? Cycle length: Cycle length is the time in seconds 
that it takes a signal to complete one full cycle of 
indications. It indicates the time interval between 
the starting of green for one approach till the next 
time the green starts. It is denoted by C.
Page 5


?Introduction
?Definition and Notations
?Design Procedure
?Fixed Time Signals
?Advantages 
?Disadvantages
?Determination Cycle length
? Saturation flow
?Problem
?Conclusion
? Traffic signals are one of the most effective and flexible
active control of traffic and is widely used in several
cities world wide.
? The conflicts arising from movements of traffic in
different directions is addressed by time sharing
principle.
? Cycle: A signal cycle is one complete rotation 
through all of the indications provided.
? Cycle length: Cycle length is the time in seconds 
that it takes a signal to complete one full cycle of 
indications. It indicates the time interval between 
the starting of green for one approach till the next 
time the green starts. It is denoted by C.
? Interval: Thus it indicates the change from one
stage to another.
There are two types of intervals :
1. Change interval and
2. Clearance interval.
? Change interval : It is also called the yellow time
indicates the interval between the green and red
signal indications for an approach.
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