Could just be biking in an area that has no biking infrastructure (i.e. bike lanes well separated from roads). I commute to work by bike daily and the most dangerous part of that is by far when I leave the cycleways between towns and have to be on the road. Motorists everywhere (except maybe Denmark or the Netherlands) seem to have a very fuck you attitude towards cyclists taking away their road; this shows mainly in disregarding right of way or attempting unsafe overtaking manoeuvres.