Barriers

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Logo. Feature : Barriers
One example for Feature : Barriers
Description
A barrier is a physical structure which blocks or impedes movement.
Tags

barrier=*

A barrier is a physical structure which blocks or impedes movement. The barrier tag only covers on-the-ground barriers, it does not cover waterway barriers (dams, waterfalls...). See also Routing#Routing obstacles and other conditions requiring special consideration.

Terminology

There are two main types: linear barriers and node barriers.

Linear barriers

Non-sided barriers

Examples:

Tagging: draw a way along the barrier location.

Sided barriers

These barriers are special because they don’t have the same height on each side. Examples:

Tagging: draw a way along the barrier location. The direction of the way is important, see natural=cliff for orientation.

If a linear barrier crosses a highway, they must connect with a node at intersection. Always tag this node with the appropriate node-barrier tag (usually an entrance or a gate), else routing engines don’t know if crossing is possible.

Node barriers

Examples:

Tagging: place a node at the location of the barrier on an existing way (either a highway or a linear barrier). Do not place a node-barrier at the junction of two highways, else it will restrict the traffic on both highways.

Note that some barriers (bollards, gates...) may be either linear or node-barriers.

Routing

Each barrier has its own accessibility defaults. Use tag access=* to override them.

Barriers with undocumented default access imply access=no. This default restriction prevents softwares from routing through undocumented barriers (and generating a potentially unsafe route).

Useful combination

See also