Merging close lines using v.clean

Buffering the road may be a solution to this problem.

• create a dissolved buffer of the road using around 20 unit map distance.

• import the layer into a postgis database and create the middle line using ST_ApproximateMedialAxis() function:

SELECT ST_ApproximateMedialAxis(geom) AS geom INTO road_centre_line FROM road_buffer;

• in order to access this function you have to enable the postgis_sfcgal extension
• with this you will get an output like this