I saw a similar thing, with a teen girl on a young horse the other day, and found myself thinking that mobile use on any form of transport should be illegal, as it is when driving a car. I no longer ride, but did for years. Horses are unpredictable, and are soon spooked by 'monsters' at every corner. I wouldn't want not to see horses on the roads, but agree with others who say it gets all riders a bad name. We had a beautiful horse shot near home recently. His rider was experienced, but the horse put his back end out so he could look at the monster (skip) he was passing, just as someone threw a heavy object in the skip, at the same time as a car overtook the horse, which was overtaking the skip, on a narrow road. His back leg was broken, it was dreadful for all concerned. Just when you feel drivers should show more consideration for horses, these idiots are risking their own lives, as well as those of others by not focussing on the horse. So dangerous.