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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 ...
A small metal, plastic or fiberglass junction box may form part of an electrical conduit or thermoplastic-sheathed cable (TPS) wiring system in a building. If designed for surface mounting, it is used mostly in ceilings, concrete or concealed behind an access panel—particularly in domestic or commercial buildings [2].
The most basic distinction among junction types is whether or not the roads cross at the same or different elevations. More expensive, grade-separated interchanges generally offer higher throughput at higher cost. Single-grade intersections are lower cost and lower throughput. Each main type comes in many variants. [1]
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The first cloverleaf interchange patented in the US was by Arthur Hale, a civil engineer in Maryland, on February 29, 1916. [3] [4]A modified cloverleaf, with the adjacent ramps joined into a single two-way road, was planned in 1927 for the interchange between Lake Shore Drive and Irving Park Road in Chicago, Illinois, but a diamond interchange was built instead.
An advanced stop line (ASL), also called advanced stop box or bike box, is a type of road marking at signalised road junctions allowing certain types of vehicle a head start when the traffic signal changes from red to green. Advanced stop lines are implemented widely in Denmark, the United Kingdom, and other European countries.
A 1956 article in the Asbury Park Press cited a suggestion by the state's top highway planner to add a "jug-handle" on Route 35 to facilitate the flow of traffic. [3] One of the earliest mentions of jughandles in The New York Times is on June 14, 1959, referring to jughandles having been built in New Jersey on U.S. Route 46 in Montville, U.S. Route 22 between North Plainfield and Bound Brook ...
Channelization is a traffic engineering concept that employs the use of secondary roads, slip lane to separate certain flows of traffic from the main traffic lanes. The method came into favor in the United States in the 1950s.