Some Brouter profiles even contain a switch to just ignore bicycle=no tags because of massive incorrect tagging.

Mandatory cycle way (G11 or G12a) is not equal to forbidden for bicycles (bicycle=no)

I can’t blame the previous editors as large parts of the Dutch police force have little knowledge about traffic regulations for bicycles as well. And road authorities seem to have no tools to draw cyclists’ attention to the presence of adjacent mandatory bicycle lanes, other then to (ab)use a prohibitory sign C14 or C15.

In case anyone would like to help?

After a week of effort and 400+ edits, the secondary roads of nearly 2 out of 12 Dutch provinces have manually been reviewed using street level images for bicycle=no assignment that should have been bicycle=use_sidepath.

This is the Overpass turbo query for JOSM export I used to find the suspects for a correctional edit:

[out:xml][timeout:25];
(
  way["highway"="secondary"]["bicycle"="no"]({{bbox}});
  way["highway"="secondary_link"]["bicycle"="no"]({{bbox}});
);
// print results
(._;>;); out meta;

ToDo:

• North of The Hague/Nijmegen
• South of Eindhoven