The Traffic Signal Controller
Placed in a dark metal box on a side of the crossing point, the signal controller is the “mind” of the framework. It is a PC that converts the data got from the detector loops and strider push buttons and changes the signal lamps as per its programming (Alberta Transportation, 2009). As per the predominant needs, the controller decides the span of the green signal for every traffic activity and controls the move from one mix of green and red signals (known as stage) to the following. It can work in a detached way or be modified to facilitate with a progression of contiguous traffic signals.
The Yellow Signal
Traffic signals transform from green to yellow to caution drawing nearer drivers that the signal is going to change to red. The span of the yellow signal relies on the maximum speed set for the street. Many of the urban crossing points have a yellow light span of 4-6 seconds. The yellow signal is for stopping in the event that it is harmless to do as such. All the automobiles, going at as far as possible toward a green signal that transforms to yellow, ought to have adequate period to stop harmlessly or move out of the crossing point prior to the signal changes to red, if the driver has got into the crossing.
The full-red phase is the period among the finishing of the yellow signal on a stage and the beginning of the green signal on the following stage. Full-red phase is utilized to give a harmless consent to automobiles that go over the stop line to the finishing of the yellow signal since they might be in risk of crashing into other automobiles or people on foot beginning in the accompanying stage (Ozawa, 2014).
The full-red phase is based upon the substantial extent of the crossings and pace restrictions of the street. Like the span of the yellow signal, the full-red period does not transform for the duration of the day.