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Although there is a osm wiki page that attempts to shed light on the different tables which are created within a postgres/postgis database there is something that is not quite made clear:

Is the data in table planet_osm_roads duplicate? (i.e. would it provide anything that could not also be retrieved however indirectly from the other tables planet_osm_line,planet_osm_point,planet_osm_polygon ?

Bonus: If as assumed this is duplicate stuff is there a way to prevent its creation in the first place (assuming it increases the costs both in time and memory and disk space)?

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    osm2pgsql is a specific purpose tool, written to setup the backend for the standardized Mapnik-based OSM rendering pipeline...and the planet_osm_roads table creation is hardcoded; it's a collection of highway tagged relations for low-zoom rendering, all 'duplicates'. either drop that table, check out the --output multi backend configuration options (you can freely setup the output table structure yourself, albeit manually), or look into other tools: ogr2ogr, Imposum, Osmium, Osmosis, osm2po, osm2postgis, osm2postgres, to name a few classics. – ThingumaBob Oct 11 at 8:14
  • @ThingumaBoI thanks for your comment, which imho alraeady features most of the aspects I have asked, maybe it could become transformed to an answer as to accept it and more clearly mark it for others faceing a similar doubt? – humanityANDpeace Oct 11 at 9:06
  • yeah...I was too lazy to fill it with links and so on, will rephrase tonight to make it an answer. – ThingumaBob Oct 11 at 9:50
  • that sounds great! Anyway thanks already for the hints! – humanityANDpeace Oct 11 at 10:12

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