Key:turn

+/- turn Description The key turn can be used to specify the direction in which a way or a lane will lead. Group Properties Element help Used combinations in World Australia/Oceania Europe (list) Asia (list) Central America (list) South America (list) Africa (list)

Contents 1 Turning indications 2 Turning indications per lane 2.1 Example for a one-way 2.2 Example for a road with both directions 2.3 Motorway with links and destinations 3 See also

Turning indications

The turn=* key can be used to specify the direction in which a way or a lane will lead. It is used on the way segment from the first indication via road markings, signposts or similar indications to the junction or completion of merge.

   turn=[left|slight_left|sharp_left|through|
         right|slight_right|sharp_right|
         reverse|merge_to_left|merge_to_right|none]

Note: there are still only a few examples for road markings and signposts in the following table. If you can provide a fitting image, please add it to the table.

Value	Description	Road marking example	Signpost example	Other example
left	left turn (only)
slight_left	slight left turn (only)
sharp_left	sharp left turn (only)
through	going straight through (only)
right	right turn (only)
slight_right	slight right turn (only)
sharp_right	sharp right turn (only)
reverse	reverse/U-turn (only)
merge_to_left	this lane merges with the lane to the left of it (only)
merge_to_right	this lane merges with the lane to the right of it (only)
none	there are no turn indications on this lane. Used especially for better readability in case of many lanes

If more than one indication is present, separate the different values with a ; (semi-colon). For example:

turn=left;through

Turning indications per lane

Usually the turning indications of a road differ from lane to lane. To specify those indications for every lane, the :lanes extension is used. For details about the :lanes-extension, see Lanes.

In short:

• The key changes to turn:lanes=*
• View the road in the direction of the osm-way.
• Add the lane-values to the value, starting with the leftmost lane and ending with the rightmost. Separate each lane-value with a | (vertical bar)

If you want to describe only the lanes of one direction of the road, use either turn:lanes:forward=* or turn:lanes:backward=*. The key turn:lanes:forward=* describes only the turning indications on the lanes in the same direction as the osm-way. The key turn:lanes:backward=* describes only the turning indications on the lanes in the opposite direction as the osm-way; doing so view the road in the opposite direction of the osm-way for this.

Example for a one-way

There are three lanes on a one-way, and the leftmost lane will turn left, the rightmost lane will turn right and the lane in the middle will go straight through the next junction.

 turn:lanes=left|through|right

Example for a road with both directions

There are two lanes on the road in each direction. Those lanes running in the same direction as the osm-way are considered to be "forward"; the others "backward". The left lane of the forward direction will turn left and the right lane will go straight through and also turns right. The left lane of the backward direction will go straight through, the right lane will turn right and also continue straight through.

 turn:lanes:forward=left|through;right
 turn:lanes:backward=through|through;right

Motorway with links and destinations

The following example shows a motorway with two links.

1.   lanes=3
     destination:lanes=A|A|B
   

2.   lanes=3
     turn:lanes=none|none|through;slight_right
   

3.   lanes=4
     turn:lanes=none|through|through|slight_right
   

4.   lanes=3
   

5.   lanes=4
     turn:lanes=none|none|none|merge_to_left
   

6.   lanes=3
   

See also

• Lanes for the description of the :lanes extension.
• destination:lanes=* for describing the direction of the highway
• The proposal for the :lanes extension