Editing Intersection (road) (section)

== Types ==
=== Road segments ===
One way to classify intersections is by the number of road segments (arms) that are involved.
* A [[three-way junction|three-way intersection]] is a junction between three road segments (arms): a '''T junction''' when two arms form one road, or a '''Y junction''', the latter also known as a '''fork''' if approached from the stem of the Y.
[[File:Fork in the road.jpg|thumb|center|120px|Fork in the road Y-junction]]
* A four-way intersection, or '''crossroads''', usually involves a crossing over of two streets or roads. In areas where there are [[city block|blocks]] and in some other cases, the crossing streets or roads are [[perpendicular]] to each other. However, two roads may cross at a different angle. In a few cases, the junction of two road segments may be offset from each when reaching an intersection, even though both ends may be considered the same street.
* Six-way intersections usually involve a crossing of three streets at one junction; for example, a crossing of two perpendicular streets and a diagonal street is a rather common type of 6-way intersection.
* Five, seven or more approaches to a single intersection, such as at [[Seven Dials, London]], are not common.

[[File:Veterans Memorial Parkway, London, Ontario.jpg|thumb|Intersection along the [[Veterans Memorial Parkway]], an at-grade [[limited-access road]] in [[London, Ontario]]|231x231px]]

=== Traffic controls ===
Another way of classifying intersections is by traffic control technology:

* [[Uncontrolled intersection]]s, without signs or [[Traffic Signal|signals]] (or sometimes with a warning sign). [[Traffic#Passage Priority (right of way)|Priority (right-of-way)]] rules may vary by country: on a 4-way intersection traffic from the right often has priority; on a 3-way intersection either traffic from the right has priority again, or traffic on the continuing road. For traffic coming from  the same or opposite direction, that which goes straight has priority over that which turns off.
* Yield-controlled intersections may or may not have specific [[yield sign|"YIELD" sign]]s (known as "GIVE WAY" signs in some countries).
* Stop-controlled intersections have one or more [[stop sign|"STOP" signs]]. Two-way stops are common, while some countries also employ [[all-way stop|four-way stop]]s.
* Signal-controlled intersections depend on [[Traffic light]], usually electric, which indicate which traffic is allowed to proceed at any particular time.

=== Lane design ===
* A [[Roundabout|traffic circle]] is a type of intersection at which traffic streams are directed around a circle. Types of traffic circles include [[roundabout]]s, "mini-roundabouts", "rotaries", "STOP"-controlled circles, and signal-controlled circles.  Some people consider roundabouts to be a distinct type of intersection from traffic circles (with the distinction based on certain differences in size and engineering).
* A [[box junction]] can be added to an intersection, generally prohibiting entry to the intersection unless the exit is clear.
* Some (unconventional or alternative) intersections employ indirect left turns to increase capacity and reduce delays. The [[Michigan left]] combines a right turn and a U-turn. [[Jughandle]] lefts diverge to the right, then curve to the left, converting a left turn to a crossing maneuver, similar to [[Roundabout#Hamburger roundabout|throughabouts]]. These techniques are generally used in conjunction with signal-controlled intersections, although they may also be used at stop-controlled intersections.<ref>Steyn, Hermanus. (2014). [https://purl.fdlp.gov/GPO/gpo54274 Displaced Left-turn Intersection Informational Guide.] Washington, D.C.: [[United States Department of Transportation|U.S. Department of Transportation]], [[Federal Highway Administration]].</ref>
*  Other designs include [[advanced stop line]]s, parallel-flow and [[continuous-flow intersection]]s, [[hook turn]]s, [[quadrant roadway intersection|quadrant]]s, [[seagull intersection]]s, [[slip lane]]s, staggered junctions (junctions consisting of two opposing T-junctions where one road intersects two sideroads located diagonally opposite each other; in American English referred to as doglegs), [[superstreet]]s, [[Texas T]]s, [[Texas U-turn]]s and [[turnaround (road)|turnaround]]s.{{clarify|date=November 2014|reason=Should this sentence be under this section? Do the items all belong in this sentence, or should they be distributed elsewhere?}}
* A [[roundabout]] and its variants like turbo roundabouts, [[bowtie (road)|bowtie]]s and distributing circles like traffic circles and [[right-in/right-out]] (RIRO) intersections.{{clarify|date=November 2014|reason=Should this sentence be under this section? Do the items all belong in this sentence, or should they be distributed elsewhere?}}