[Qgis-user] Centre of the roads from polygons to lines

[Matej Mailing]

Hi,

I have a layer that contains roads in polygons and I need to get
central lines of the polygons. When I convert directly from polygons
to lines, I get two lines for each part of the road representing road
"boundaries" which isn't good.

What is the best way to achieve it?

Thanks,
Matej