Traffic facing a circular signal may proceed straight through cautiously or turn right or left unless a sign prohibits either such turn.

Traffic facing a circular GREEN signal may proceed straight through cautiously or turn right or left unless a sign prohibits either such turn.

Explanation:

Traffic signals control and regulate all road users. They prohibit, permit, stop, make proceed, indicate the direction, etc. Three basic traffic signal colors are:

RED - stop

YELLOW - continue carefully

GREEN - go.

Traffic lights can also have the shape of an arrow.

In the example, the green traffic light permits the vehicles to proceed, but they should we cautious whenever they are at a crossroads. If there is no sign of prohibition, they can turn right or left.

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