27-07-2012, 03:33 PM
TRAFFIC SIGNAL DESIGN
traffic signal design.pptx (Size: 490.68 KB / Downloads: 54)
Definitions and notations
Cycle
One complete rotation through all of indications
Cycle length
Time taken to complete one full cycle of indications
Interval
Change from one state to another
Change inteval
Clearence interval
Phase design
The signal design procedure includes :
Phase design
Determination of amber time and clearence time
Determination of cycle length
Apportioning of green time
Pedestrian crossing requirements
Evaluation of design
Significance
Orderly movement of traffic
Increase traffic handling capacity
Can reduce accidents
Can be coordinated to provide continuous movement of traffic
Can be used to interrupt heavy traffic to permit pedestrians to cross
Can assign right of way impartially to traffic unlike manual controls