Generally, traffic signal phase can be divided into the following Settings:

The first: a brief 2 phase

When the intersection is an equal weight less and traffic flow of intersection, and turn left under the circumstances of less vehicles, can be set.

The second: a brief 3 phase

Set up a dedicated left lane, as a main branch of transportation under the condition of less, can turn left alone on the road again add signal phase, so the intersection of three phase usually can use a brief manipulation.

The third: a brief 4 phase

When the intersection of traffic on the main and branch are larger, and set up alone in the main and branch of the left lane, the intersection signal control can be set to a brief 4 phase.

Fourth: mixed and disorderly eight aspects

Messy 8 phase needs under the condition of the induction check green optimization phase

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