At an intersection with traffic lights, a green arrow showing at the same time as a red traffic light means that you can proceed and turn right or left, depending on the direction of the arrow, but you cannot go straight because the red light is on at the same time.
Despite being globally standardized, there are differences in traffic light legislation and sequences at the national and municipal levels. On Parliament Square in London, the technique was first used in December 1868 to lessen the need for police personnel to regulate traffic.
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