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parent: Using BRouter
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# Download Routing Segments

Routing data files are organised as 5\*5 degree files, with the filename
containing the south-west corner of the square, which means:

- You want to route near West48/North37 -> you need `W50_N35.rd5`
- You want to route near East7/North47 -> you need `E5_N45.rd5`

These data files, called _segments_ across BRouter, are generated from
[OpenStreetMap](https://www.openstreetmap.org/) data and stored in a custom
binary format (rd5) for improved efficiency of BRouter routing.

## Download them from brouter.de

Segments files from the whole planet are generated weekly at
[https://brouter.de/brouter/segments4/](http://brouter.de/brouter/segments4/).

You can download one or more segments files, covering the area of the planet
your want to route, into the `segments4` directory.