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The "blue sign" is called sign posts (or exit signs) and they can be blue or green.
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And only now it is done!
A trip of 300 km this weekend showed me again the dreaded "blue lines" mainly on ramps and exits from highways.
Still not on the spots I tested first (and after that I believed it was cured) but on some other spots.
Tinkering with the sys.txt again and this is what I need:
show_lane_info=0
show_junction_view=0
Both!
1. Junction_view was at "1". Allthough in the program setting it was off, but that only prevents the "photo's" of junctions on my screen, NOT the coloured artifacts on junctions.
2. Alternating both commands between 0 and 1 shows artifacts at different junctions or even at different pieces of a junction lane.
3. I even couch-tested Paris so I believe it is cured now.
Thanks again all.