I'm sorry, but you just don't know where I ride my horse. I've been on my horse when a semi has gone past less than half a metre away with a massive ditch on the other side with nowhere to go - Yes my horse spooked, but because I 'ride though' things, I was able to keep enough control of his body to keep him pointed and moving in the right direction so we where fine.
We don't have hedges like you but we certainly have roads bordered by barbed wire, tiny grass verges in the middle of highways, concrete footpaths right nest to roads with suburban fences on the other side.
One situation we regularly face is traffic on one side and someones massive dog in their backyard going nuts behind the fence on the other side. Once again the horse may spook but we maintain enough body control to keep them travelling on the same line.
We ride footpaths across bridges that have traffic on one side and a drop down into a creek on the other.
Foot bridges across creeks that are barely wide enough for one horse to cross.
Causeways that flood and have only a metre or so wide section you can cross and if you deviate you will be washed away.
I do also ride in lovely open spaces, i'm lucky enough to have the best of both worlds, living on the edge of a city. But please don't tell me you know everything my horses have to deal with when you aren't here and don't see where we ride. Riding in the CBD of the nations capital certainly provides some very scary and high stress situations for a horse.