Lane assist/Examples/Motorway Deceleration Lane at Exit

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Main article: Lane_assist

Exit 115 on the motorway A9 in Styria, Austria. Background image (C) geoimage.at .

Note: The image (not the description) below is a little outdated, as the nodes of the ways should be placed between the leftmost two lanes even when the deceleration lane is present. In such case the key placement=* is used, which will lead to better results for renderers which do not support the key as well as for which do support the key.

Motorway Tagging Example 01.jpeg

  • A: Ordinary motorway with two lanes.
highway=motorway
oneway=yes
ref=A9
lanes=2
  • B: The nodes are placed in the middle of the two lanes. The OSM-way is split at this node.
  • C: Road markings of turning lanes are present.
highway=motorway
oneway=yes
ref=A9
lanes=2
turn:lanes=none|through;slight_right
  • D: The deceleration lane starts. The node is placed in the middle of the two lanes and the OSM-way is not yet split.
  • E: The deceleration lane has reached its full width, therefore the OSM-way is split at this node. The node is still placed in the middle of the leftmost two lanes.
  • F: Three lanes are visible, two with road markings. As the way is not drawn in the middle of the carriageway but rather at the right side of the first lane, the appropriate placement tag is used.
highway=motorway
oneway=yes
ref=A9
lanes=3
turn:lanes=none|through|slight_right
placement=right_of:1
  • G: The name and reference number of the exit is given on a signpost. At the beginning of the separation of the deceleration lane, the OSM-way of the motorway is split and the new OSM-way of the slip road starts. The node is placed in the middle of the leftmost two lanes and tagged as motorway junction.
highway=motorway_junction
name=Mautern
ref=115
  • H: The OSM way of the motorway continues.
highway=motorway
oneway=yes
ref=A9
lanes=2
  • I: The OSM way of the slip road. Signposts indicate that the road ahead is referred to as B113 and is leading to Mautern.
highway=motorway_link
oneway=yes
lanes=1
destination=Mautern
destination:ref=B113
  • J: The node of the motorway is placed in the middle of both lanes, the node of the slip road is placed in the middle of the lane.


Note about the placement of nodes G and J: This placement of the nodes 1) guarantees an acceptable rendering result, and 2) prevents misleading routing instructions. Some people might prefer to place node G at the beginning of the physical separation instead of the legal one (as in the example). Also if the legal separations starts very long before the physical one it is recommended to split not at the beginning of the legal separation but slightly before (or at) the physical one. Please consider to use change:lanes=yes|not_right|not_left to indicate the legal separation (i.e. the solid line) before the physical separation.