Pt-br:Key:bridge

+/- bridge Descrição A ponte é uma construção artificial que se estende por uma estrada, ferroviária, fluvial ou outro recurso e carrega um rodoviário, ferroviário ou outro recurso. Discussão em Português Discussão em Inglês Grupo Properties Elemento ajuda Útil combinação Implica Tagstat ajuda Mundial Tagwatch ajuda Europa França Alemanha Grã-Bretanha Grécia Islândia Itália Holanda Espanha Turquia

A ponte é uma construção artificial que se estende por uma estrada, ferroviária, fluvial ou outro recurso e carrega um rodoviário, ferroviário ou outro recurso.

There is a single "bridge=<type>" tag:

bridge=yes

bridge=aqueduct

bridge=viaduct

bridge=swing

bridge=...

which includes various bridge and bridge-like structures like viaducts and aqueducts.

In other words, all bridge-like structures are values of the bridge tag. This is acceptable on nodes and ways, although most instances are on short-ish ways.

In case of an undercrossing/underpass you have to decide on the basis of the construction if you are over a tunnel or on a bridge. The ramps on both sides at an overpass are not part of the bridge. A ramp can be tagged as embankment.

Contents 1 How to Map 2 Complex Bridges 3 Combining with Key:layer 4 Relation 5 Rendering 6 See also

How to Map

The way of a street or of a railway has to be split in three parts: the way before the bridge, the bridge itself, the way after the bridge. Often the bridge will not connect directly to a junction in which case you should add a piece of road connecting the two.

1. Mark the beginning of the bridge (abutment) by a node.
   In JOSM split the line by key P, in Potlatch by key x.
2. Mark also the end of the bridge by a node.
   In JOSM split the line by key P, in Potlatch by key x.
3. Now select the way representing the bridge.
4. Add the attribute bridge=yes.

Example for a primary road:

highway=primary
+ bridge=yes
+ layer=1
+ name=usually the road over the bridge
+ ref=*

For the name of the bridge itself there are two proposals: bridge_name (en) and one using relations (en)

Other useful tags:

• maxweight=* - max load
• maxspeed=* - speed limit
• maxheight=* - use this on the road under the bridge
• height=* - height over ground
• length=* - length
• maxheight:marine=* - for sailing clearance under the bridge, use this ONLY if you are sure about it

Complex Bridges

For the description of complex bridges, where two or more bridges cross each other, we use Key:layer:

highway=motorway - the ground level
+ layer=0

highway=motorway - the first bridge from ground level
+ bridge=yes
+ layer=1

highway=motorway - the upper bridge
+ bridge=yes 
+ layer=2

There are five layer-degrees upwards (1 to 5), and five downwards (-1 to -5).

For ascending/descending chutes we dont use a layer.

When there are several bridges close together it is sometimes acceptable not to tag them as bridges, but to tag the single road below as going through a tunnel.

Combining with Key:layer

Tag layer=* is used to separate things that are physically on different levels. The tag bridge=* does not imply anything about layers, so if your bridge crosses any feature on layer=0 (the default if not present), you should consider adding a layer=1 (or higher).

Relation

A bridge can also be tagged as a relation. The proposal can be found under: Relations/Proposed/Bridges_and_Tunnels (en). This enables the grouping of several ways using the same bridge. The relation also enables tagging the number of the bridge (in germany bridges and tunnels have "Bauwerksnummern").

Rendering

In Osmarender (en) (version 4) bridges are drawn with a black outline ending in angled little stubs. The road is drawn on top as usual depending on its type. Mapnik (en) uses a black outline for bridges. JOSM (version 2561) defaults to usage of a blue-colored way segment. In the JOSM wireframe view, there is no distinction between bridge and non-bridge way segments.

• 

  Osmarender (en) unclassified

• 

  Osmarender (en) cycleway (en)

• 

  JOSM

• 

  JOSM wireframe

See also

• Key:name - Name of bridge or road through the bridge
• Key:layer - specify the layering of your ways in special cases.
• Approved features/bridge (en) - discussion and voting for extension of values
• Proposed_features/Bridge_Name (en) - proposal for the name of the bridge itself
• Relations/Proposed/Bridges_and_Tunnels (en) - group multiple bridge elements with a relation