Key:construction

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Public-images-osm logo.svg construction
12Jan05 04.jpg
Description
The construction tag may be used for any road or railway under construction.
Group: Lifecycle
Used on these elements
should not be used on nodes
may be used on ways
may be used on areas
may be used on relations
Useful combination
See also
Status: Unspecified

Major road and rail construction schemes typically several years to complete. Use this tag to denote active construction sites (for projects being planned, where there is little or no evidence for them on the ground, use proposed=* instead).

As OSM data is often used offline (and therefore may be several months old), only tag construction sites (particularly roads and railroads) if they are planned to be closed for at least six to nine months. Don't use construction=* to tag short-term closures (e.g. a road closed over a weekend to replace a sewer pipe); consider using conditional restrictions instead.

Usage

construction=* must be used together with tags such as highway=construction, railway=construction, landuse=construction, and building=construction. The value of the construction=* key indicates the type of feature being built (you can use any value from from highway=*, railway=*, landuse=*, and building=*).

Another option is to set the tag construction=yes. While this allows you to tag just about any feature as being "under construction", it's usually not well supported by the map renderers and other data processors, and is therefore not recommended.

If you know the date at which a construction site is expected to be completed, you can tag it with opening_date=*. Additionally, you can use check_date=* to denote when you last checked/updated the values (this can be useful as large construction projects are often delayed).

For instance, to tag a residential road under construction, use highway=construction and construction=residential. To tag a tramway under construction, use railway=construction and construction=tram.

Highways

In addition to using highway=construction, you should also tag the type of highway being built by using construction=*. For instance, to mark a primary road under construction, tag it with highway=construction and construction=primary.

For minor road-works (where the road in question remains open), use construction=minor (and don't use highway=construction, but leave it at its default value).

Values

highway=construction with any of the following values for construction=* will render on the default Mapnik layer at zoom level 12 and above:

Value Element Comment Rendering
motorway Way Motorway under construction Highway-construction.png
motorway_link Way Motorway sliproad under construction  
trunk Way Important non-motorway road under construction  
trunk_link Way Sliproad to an important non-motorway road under construction  
primary Way Primary road under construction Primary-construction.png
primary_link Way Sliproad to a primary road under construction  
secondary Way Secondary road under construction  
tertiary Way Tertiary road under construction  
unclassified Way Unclassified road under construction (alternatively tag <construction=minor>)  
residential Way Residential road under construction  
pedestrian Way Pedestrianised road under construction  
service Way Service road under construction  
track Way Track under construction  
bridleway Way Bridleway under construction  
cycleway Way Cycleway under construction  
footway Way Foot path under construction (alternative tag <construction=footpath>)  
steps Way Steps under construction  

In all cases, the way will be rendered as a dashed version of the corresponding highway=* tag.

Railways

Similarly to highways above, tag the railway under construction with railway=construction and the type of railway being built with construction=*. The following values for construction=* will render on Osmarender at zoom levels 14 and above:

Value Element Comment Example
rail Way Standard gauge railway under construction  
narrow_gauge Way Narrow gauge railway under construction  
light_rail Way Light-railway under construction  
tram Way Tramway under construction  
preserved Way Preserved railway under construction e.g. for steam trains  
subway Way Subway under construction  
monorail Way Monorail under construction  

In all cases, the way will be rendered as a dashed version of the corresponding railway=* tag.

Notes

Since most construction sites are not accessible to the public, it might be tough to get detailed GPS tracks of roads which have not yet been built. In that case, it's usually sufficient to roughly trace the route, and increase the detail level once the road is open.

See Also

  • proposed=*, for features which are being planned, but for which construction has not yet started.