At-grade intersection

At-grade intersection
A diagram of an at-grade intersection
An unusual at-grade intersection with mixed modalities at London Heathrow Airport, England. A British Airways Boeing 777-200 is being towed across a public road on its way to the maintenance hangars.

An at-grade intersection is a junction at which two or more transport axes cross at the same level (or grade).

Traffic management

With areas of high or fast traffic, an at-grade intersection normally requires a traffic control device such as a stop sign, traffic light or railway signal to manage conflicting traffic.


The various types of at-grade intersections have different names. Examples are intersection (roads), level junction (railways) and railroad crossing (both). Some of them can also mix transportation modalities. An example of this is the railroad grade crossing (American English) or level crossing (British English) where roads cross railways at grade.

See also

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Intersection (road) — Crossroad in Kharkov An intersection is a road junction where two or more roads either meet or cross at grade (they are at the same level). An intersection may be 3 way a T junction or fork, 4 way a crossroads, or 5 way or more. It may often be… …   Wikipedia

  • Grade separation — [ thumb|right|200px|An example of a four level stack interchange in the Netherlands.] Grade separation is the process of aligning a junction of two or more transport axes at different heights (grades) so that they will not disrupt the traffic… …   Wikipedia

  • grade crossing — grade′ cross ing n. rai an intersection of a railroad track and another track, a road, etc., at the same level Also called, Brit.,level crossing …   From formal English to slang

  • grade separation — noun a crossing that uses an underpass or overpass • Hypernyms: ↑crossing, ↑crosswalk, ↑crossover * * * noun : a crossing of two highways or of a highway and pedestrian path or railroad utilizing an underpass or overpass * * * separation of the… …   Useful english dictionary

  • grade crossing — noun intersection of a railway and a road on the same level; barriers close road when trains pass • Syn: ↑level crossing • Hypernyms: ↑intersection, ↑crossroad, ↑crossway, ↑crossing, ↑carrefour …   Useful english dictionary

  • grade crossing — The intersection formed by a railroad and a highway at a common grade. Cowles v New York, New Haven & Hartford Railroad Co. 80 Conn 48, 66 A 1020 …   Ballentine's law dictionary

  • grade crossing — an intersection of a railroad track and another track, a road, etc., at the same level. Also, Brit., level crossing. [1885 90, Amer.] * * * …   Universalium

  • intersection — Synonyms and related words: access, accord, accordance, affinity, agreement, aisle, alley, ambulatory, aperture, arcade, artery, assent, avenue, carrefour, channel, chiasma, chorus, cloister, cloverleaf, coherence, coincidence, colonnade,… …   Moby Thesaurus

  • Continuous-flow intersection — in West Valley City, Utah showing the layout and normal traffic flow in the southwest portion of the intersection. Continuous flow intersection (CFI), also called a crossover displaced left turn (XDL), is an at grade intersection that moves the… …   Wikipedia

  • Seagull intersection — A seagull intersection is a common type of three way at grade intersection, usually used on high traffic volume roads and dual carriageways. This form of intersection is popular in Australia and New Zealand. Design Note: This section refers to… …   Wikipedia

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