23-06-2012, 04:14 PM
Traffic signal design
[attachment=25302]
Need of traffic signal
Decrease in accident rate
To maintain traffic
Increase of traffic handling
- To maintain a traffic at junction
Time is being save
Components of traffic signal
Main display with red, yellow, and green lights.
B) Pedestrian crossing lights containing both the “WALK” and “DON’T WALK” light indications.
C) Traffic signal cabinet containing the traffic signal controller
-
Vehicle Detection Systems,
D) Inductive loops or sensors
Or
E) Video detection system
Purpose of traffic signal
Moving traffic in an orderly fashion;
Minimizing delay to vehicles and pedestrians;
Reducing crash-producing conflicts; and
Maximizing capacity for each intersection approach.
Advantage of traffic signal
Provide for orderly movement of traffic
Increase traffic capacity of the intersection
Reduce the frequency of certain types of crashes (e.g. right-angle crashes);
Provide for continuous or nearly continuous movement of traffic along a given route;
Interrupt heavy traffic to permit other traffic, vehicular or pedestrian, to cross
Disadvantage of traffic signal
Excessive delay;
Excessive disobedience of the signal indications;
Increased use of less adequate routes as road users attempt to avoid the traffic control signals;
Significant increases in the frequency of crashes (especially rear-end crashes).
[attachment=25302]
Need of traffic signal
Decrease in accident rate
To maintain traffic
Increase of traffic handling
- To maintain a traffic at junction
Time is being save
Components of traffic signal
Main display with red, yellow, and green lights.
B) Pedestrian crossing lights containing both the “WALK” and “DON’T WALK” light indications.
C) Traffic signal cabinet containing the traffic signal controller
-
Vehicle Detection Systems,
D) Inductive loops or sensors
Or
E) Video detection system
Purpose of traffic signal
Moving traffic in an orderly fashion;
Minimizing delay to vehicles and pedestrians;
Reducing crash-producing conflicts; and
Maximizing capacity for each intersection approach.
Advantage of traffic signal
Provide for orderly movement of traffic
Increase traffic capacity of the intersection
Reduce the frequency of certain types of crashes (e.g. right-angle crashes);
Provide for continuous or nearly continuous movement of traffic along a given route;
Interrupt heavy traffic to permit other traffic, vehicular or pedestrian, to cross
Disadvantage of traffic signal
Excessive delay;
Excessive disobedience of the signal indications;
Increased use of less adequate routes as road users attempt to avoid the traffic control signals;
Significant increases in the frequency of crashes (especially rear-end crashes).