Mapbox data-team are working on realigning major highways in Japan, together with OSM Japan Community. This is a collective effort to improve the quality of OSM maps in Japan. For all of us who worked on Japan this is a very difficult task, because many roads are split into several parts with the same version, tags and direction.

To solve this problem I created a script to use in josm-scripting-plugin,that allows us to combine highways which are:

• Highways with version =1
• Highways which use tags (motorway,trunk,primary,secondary,tertiary)
• Highways with the same direction
• Highways with the same tags
• Highways which are not part of a relation
• Highways intersections with an angle of > 150 && < 210 degrees

You can find the script and documentation here.

If you have the chance, feel free to modify the script, add support for Residential roads or other roads, and for any type of roads

I would like to know from community if there is a official repository to add this kind of script to share with whole community. If it exist, let me know.