Why do some left-turn arrows allow vehicles to turn only when the green arrow is displayed and not during the through phase?
This type of left-turn phase, known as “protected-prohibited” is designed to separate left-turning traffic from opposing through traffic. Even if an acceptable gap exists in the oncoming through traffic, vehicles are required to wait for the green arrow to turn left. This operation is used when a combination of vehicle approach speeds, intersection widths and other intersection factors are such that left turns cannot be made safely without the protection of an arrow each cycle. Protected-prohibited left turns are in operation at intersections such as Garden City Road and Westminster Highway, Russ Baker Way and Miller Road and Garden City Road and Sea Island Way.
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