OpenStreetMap -    ,<br>
   ,<br>
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: <a href=http://www.openstreetmap.org>http://www.openstreetmap.org</a>
The Layer overlay shows ways tagged with layer=*. Layers 2,3,4 and 5 are in shown in orange, layer 1 in red, level 0 in green, level -1 in blue and levels -2, -3 and -4 are in light blue.
<img src="014.png">