[Qgis-user] help for road symbology

[Luca Galuppini]

dear all, i think this is a simple question but i cant find an answer
googling it...
i am working on the symbolization of a road network downloaded from OSM,
using qgis 2.8.2.
i have a single shapefile, each road segment has attributes (name, type,
bridge, tunnel etc...)
i have symbolized it using "categorized" symbols by "type" column (major
roads are thicker and in different color etc...)
all roads have black outlines, and they all blend together as i worked on
the symbol levels to obtain that
the problem is that i would NOT like the roads to blend as they do in
crossroads, when they are not crossroads: ie when there is a bridge or
underpass and the roads dont actually join.
i think i can do it using the bridge value. in other words i have to
instruct qgis to do the following:
- if "bridge" value is "1" road should be represented on the top of the
intersecting roads bearing value "0"
- if crossing roads have the same bridge value, they should join (it is a
crossroad)
is there a way to obtain it??? style rules can help? and how?

thank you
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