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High Quality Content by WIKIPEDIA articles! The yellow trap is a potentially-dangerous scenario in traffic flow through a traffic light relating to permissive left turns. It occurs when a circular yellow light is displayed to a movement with permissive left turns, while at the same time, opposing through traffic still has a circular green light, causing left-turn drivers to presume it is safe to complete a left turn on yellow, when it is not safe to do so. Solutions to the yellow trap include the flashing yellow arrow, Dallas phasing, Arlington phasing, simultaneously ending both through movements (circular green lights) before serving both left-turn movements (green arrows), or prohibiting one of the two left-turn movements (see List of variations in traffic light signalling and operation). Many agencies in North America routinely allow the yellow trap, especially during emergency vehicle preemption, despite clear prohibition from the Manual on Uniform Traffic Control Devices (unless a sign reading '"Oncoming traffic has extended green"' or '"Oncoming traffic may have extended green"' is used).