If you are using road_width or whatever....I don't where you find it....simply if the road have thickness for example 5mm then when nextgen zoom at turns simply zoom settings you have zoom the arrow quidance to 15mm...
So, trying to fix road thickness...new problem start...
The best way to solve those problem in nextgen is stop using road_width or whatever and manipluate sys.txt in [zoom] section and in [map] section...
In addition those personal manipulation depended to user furthermore depended to device dpi....
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