I cannot reproduce the problem with the roads, they look fine on my computer. 
Could you try out to change the value of MARGIN here:

http://bazaar.launchpad.net/~widelands-dev/widelands/render_queue/view/7400/src/graphic/gl/road_program.cc#L129

It must be as small as possible but it might have artifacts (lines in the 
roads) if it is too small. start at 0 and make it larger step by step.
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