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A 4-way stop in San Francisco. An all-way stop – also known as a four-way stop (or three-way stop etc. as appropriate) – is a traffic management system which requires vehicles on all the approaches to a road intersection to stop at the intersection before proceeding through it.
The regular traffic light colours are red to stop traffic, amber for traffic change, and green for allowing the traffic, arranged vertically or horizontally in that order. Although this is internationally standardised, [4] variations in traffic light sequences and laws exist on national and local scales. [5]
Traffic signal preemption (also called traffic signal prioritisation) is a system that allows an operator to override the normal operation of traffic lights.The most common use of these systems manipulates traffic signals in the path of an emergency vehicle, halting conflicting traffic and allowing the emergency vehicle right-of-way, thereby reducing response times and enhancing traffic safety.
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An uncontrolled intersection in suburban Melbourne, Australia. At uncontrolled 4-way intersections, the common rules are: . give way to traffic approaching from the passenger's side (i.e. from the right in countries that drive on the right-hand side, a rule known as priority to the right, and vice versa) [citation needed]
The exception is in Kansas City, where city ordinance allows left turns from a one-way street onto another one-way street while the light is red, as long as the intersection is clear.
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In New Zealand, where they drive on the left, when a road is given a green light from an all direction stop, a red arrow can continue to display to turning traffic, holding traffic back while the pedestrian crossing on the side road is given a green signal (for left turns) or while oncoming traffic goes straight ahead and there is no permissive right turn allowed (for right turns).