JA:Tag:highway=motorway link
+/- highway=motorway_link
The link roads (sliproads / ramps) leading to and from a motorway.
Used combinations in
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The link roads (sliproads / ramps) leading to and from a motorway. Normally with the same motorway restrictions.
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マッピング方法
 
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Mapping a motorway link is quite easy. In the first example left you can see a dual carriage motorway where another way (green) branches off. This way should be tagged with highway=motorway_link.
The second example shows a more difficult junction. In this example you can leave the highway and enter it. For this create 2 different ways (orange) and tag them separately with highway=motorway_link. Be sure to check the direction of the arrows. The green way in this example can then be a simple junction with highway=motorway_link and oneway=no. To attach more information for the motorway_link you should add the destination of the motorway, the link belongs to:
To attach more information for the motorway you should add the junction number.
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異なった種類の highway の間のリンク
If a road leads from a motorway to a non-motorway, only the portion that solely carries traffic to or from the motorway should be tagged as motorway_link. Any other roads used to connect the motorway to a non-motorway, which can also be used by non-motorway traffic, should be tagged as something less than motorway_link, usually the *_link of the non-motorway.
高速道路のサービスエリア
Besides its use for on/off ramps motorway_link can also be used for the slip roads into and out of motorway service/rest areas. In this case the motorway_link should go from the motorway towards the services as far as motorway regulations (for example no pedestrians) apply. This is usually indicated by a sign. Similarly the exit road from the services should be a motorway_link from the point where motorway regulations commence.
例
巨大な高速道路ジャンクション
This is a example of a more complicated junction between 2 different motorway junctions. You can see this in Germany quite often this example shows the Autobahnkreuz A 1/A 27 osm link.
If you take a closer look you can see the A 1 in blue lines going from left to right and the A 27 from north to south. The A 27 runs over the A 1 and therefore it is splitted into 3 sections. The dark blue part is a simple motorway with highway=motorway. The light blue part is tagged with highway=motorway,bridge=yes and layer=1.
In addition various junctions exist to get from one motorway to another. You can see that parallel to every motorway part runs a orange way. They are used as a link between the motorway and the original junction. They are tagged with highway=motorway_link and usually maxspeed=80 as you have to slow down there. The orange way beside the A 27 which goes from north to south is again split into 3 parts to insert the bridge=yes and layer=1 tags at the purple marked location.
The last parts of this junctions are simply the links shown in yellow and green which just the highway=motorway_link tag.
To enhance this junction some of the nodes could be tagged with highway=motorway_junction and the associated name. As well as a more complex way to deal with the layer=* and bridge=yes part to allow the renderer a better image processing.
Note for Germany: The links between the main motorways should only be tagged with the ref=* of the motorway they are going to, if there are signs or other sources saying, wich ref it is.
