Road safety is constantly on the agenda. Many riders that I have observed are unable to control their animals on the public roads. We are regulated to within an inch of viability in our cars so why should these animals be allowed to wander the highway unregulated.
I think horses should be banned from public roads. Horses and their riders pay no road tax, they cause certain motorists to behave in an irresponsible way by refusing to pass these animals until they can pass with an absurdly wide berth. At the very least, people riding horses on the public road should pass a test and understand the highway code.