Rationale

Divider - a divider on a single carriageway is a description of a way which has a physical or legal divider that divides opposing direction lanes and prevents crossing the way in a particular direction. In right side driving countries left turns and u-turns are not allowed, in left side driving countries right turns and u-turns are not allowed.

There are various physical divider types, either crossable or non crossable: concrete barriers or wall (e.g., Jersey Barrier (Wikipedia)), grass strips, tram tracks

There are several legal divider types: double or single solid lines (no legal crossing), solid lines+stripes (no legal crossing in one direction), painted areas.

A divider also describes prohibited turn restrictions.

There exists a similar GDF composite attribute "Divider", consisting of the sub-attributes "Divided Road Element" (boolean), "Divider Type" (with values: physical+not crossable, physical+crossable, legal=not physical), and "Divider Width" (width in metres). This proposal merges the first two attributes into one tag.

Applies to

• Ways, restricted to single carriageways with opposing direction lanes

Usage

<tag k="highway" v="..."/>
<tag k="divider" v="solid_line"/>

Tag Values

• No divider:
  • none (can be used to explicitly mark the absence of a divider)
• Physical, not crossable:
  • concrete_barrier
  • guard_rail
  • grass_strip (this divides indicates a dual carriageway, i.e., two parallel ways for the opposing driving directions)
• Physical, crossable:
  • dots (subsumes all raised pavement markers)
  • tram_tracks (with no kerbs)
• Not physical, legal:
  • solid_line (either double or single solid line depending on the country)
  • solid_area (like solid_line; painted area)
  • solid_line+stripes, stripes+solid_line (a solid_line which is legally crossable from one side; this makes "divider" dependent on the direction of the way)

With the exception of "none", "solid_line+stripes", and "stripes+solid_line", all divider values describes that it is not allowed (or not possible) crossing the way.

Rendering

The way according to the highway tag with a thin solid line in an appropriate color in the middle of the way.

Remarks

If a way is only partially divided, the divider and the divided section has to be specified using a relationship. This relationship consists of the members way, start node, and end node of the divided section, and the tag "type=divider" and "divider=...".

Comments

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