Crossroads

A road crossroads is with the clean direction the zone included/understood inside the prolongation of the edges (or, if there are no edges, banks) of two roadways which are cut to right angle or almost right. More generally it is about the zone in which vehicles moving on different roads which are cut to unspecified angle, can meet.

Etymology

The word Carrefour comes from bottom Latin quadrifurcus , which has four forks or divisions, itself coming from quadri , four, and furca , fork.

Concept of branch

The branch (“ Intersection leg ” in English) is the portion of any of the roadways connected to the crossroads and located at I' external of the zone of the crossroads itself.

One distinguishes two types of branches:

  • the Entry (“ Approach ” in English). : Started from this branch which the circulation traverses which moves towards the crossroads.
  • the Exit (“ Exit English ”). : Started from this branch which circulation traverses when it leaves the crossroads.

Plane crossroads

Junction T

It is about a crossroads with three branches (“ Three leg intersection ” in English) whose I' one of these branches is about in the prolongation of another branch and of which third cut this prolongation under an angle ranging between 75 and 105°

Fork junction

It is about a crossroads with three branches whose I' one of these branches is in the prolongation of another and whose third branch cuts this prolongation under an angle lower than 75° or higher than 105°.

Crossroads in simple cross

It is about a crossroads with four branches (“Furnace leg intersection” in English) .dont two of these branches are about in the prolongation of the two other branches and for which I' angle of these prolongations is of 75° or more while remaining lower than 105.

Crossroads in X

It is about a crossroads with four branches whose two branches are about in the prolongation of both others, and for which I' angle of intersection of these two prolongations is lower than 75° or higher than 105°.

Crossroads with multiple branches

A crossroads with multiple branches ( Multi-leg intersection ) is a crossroads with five branches or more.

Roundabout

A roundabout ( Roundabout in English) is a crossroads with three branches or more in which the currents converge then divergent on a roadway with one way surrounding a central small island; circulation on this roadway is done in the opposite direction of the needles of a watch, (in the countries where one rolls on the left, circulation is carried out in the direction of the needles of a watch).

Uneven crossroads

An uneven crossroads is a whole of two or several roads which cross on levels separated by the means of one or several works of Article That makes it possible Ia circulation of each one of these roads to cut the circulation of all the other roads without conflicts.

Exchanging highway

An exchanger ( Interchange ) is a junction grade-separated between two or several Autoroute S. One speaks about highway node for an exchanger between several Autoroute S,

In the most complex cases, the roadways can be staged on four different levels (exchanger known as " Furnace-stack"). An exchanger can be complete (bidirectional) or partial (giving access to only one direction of the highway).

Diffuser

A diffuser is a junction grade-separated between a Autoroute and the highway network. It can be complete (if it makes it possible to enter and leave the highway in the two directions) or incomplete. A half-diffuser comprises an entry and an exit in opposite direction.

See too

  • Junction signal-controlled

Internal bonds

road Doctrines | Typology of the roads | general Design of the layout of a road | Profile across a road | Alignment of a road | Profile longitudinally of a road


Sources

  • Capacity of the roads (highway capacity manual) - SERCR - 1965.

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