Intelligent traffic signal system parameters:

Cycle:

Refers to the traffic lights change of color, display the time needed for a cycle, also known as the cycle is long, is the sum of the red, yellow, and green light time.

Phase:

The signal phase, it is to point to in the cycle time according to the demand of artificial, right of way at the same time the group a sequence of one or several traffic flow.

Phase:

Refers to the same cycle long related crossroads, in tongfang up two related startup time lag phase.

Saturation flow rate:

Is an important parameter of measuring intersection traffic flow casting ability, usually refers to a green light time of the maximum flow straight through the intersection.

Flow coefficient:

Is the ratio of actual flow and the saturation flow. Is not only an important parameter, calculation of signal timing is a measure of intersection degree of obstruction.

Green letter than:

Intelligent traffic signal control system within the green letter than long refers to the period of the aspect ratio of the green time and cycle is long.

Green light interval time:

Refers to the aspect of the green light from the loss of right of way over, to the next by phase green light to start the time passage.

Effective green time:

Refers to the actual traffic by effective use of time. It is equal to the sum of green and yellow light time minus the head start the loss of time