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A box junction in London, pictured from atop the Monument in 1969. A box junction is a road traffic control measure designed to prevent congestion and gridlock at junctions.The surface of the junction is typically marked with a yellow criss-cross grid of diagonal painted lines (or only two lines crossing each other in the box), and vehicles may not enter the area so marked unless their exit ...
Some signs can be localized, such as No Parking, and some are found only in state and local jurisdictions, as they are based on state or local laws, such as New York City's "Don't Block the Box" signs. These signs are in the R series of signs in the MUTCD and typically in the R series in most state supplements or state MUTCDs.
At an uncontrolled T-junction (3-way intersection), right of way rules differ from country to country. In Australia, the United Kingdom, New Zealand [1] and parts of the United States (really just California as is cited), [2] [additional citation(s) needed] traffic on the terminating road must give way (yield) to traffic on the continuing road.
Junction signs inform travelers that they are approaching an intersection with a numbered highway. Guide signs inform travelers which way to go at intersections, usually with an arrow pointing the way. These include: Directional assemblies, which combine highway shields with separate cardinal direction signs and arrow signs on the same post, and
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As of the road networks increased in density and traffic flows followed suit, managing the flow of traffic across the junction became of increasing importance, to minimize delays and improve safety. The first innovation was to add traffic control devices, such as stop signs and traffic lights that regulated traffic flow. Next came lane controls ...
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