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Marco,
What type of alignment are you using with these road styles? Are you drawing these roads or bringing linework in from CAD or some other place? I've had the crashing issues sometimes and it seems like it occurs most frequently when I bring in a curve from Microstation or AutoCAD that has too many verticies. The best solution is to 'weed' the verticies when you are in the CAD program and then bring it in. AIW needs less definition for curves than the CAD programs give them.