I took both my 3 year old horses from a quiet environment to my trainer's at a very busy stables next to a busy road and an international airport. I visit them often and watch them stand quietly as cars, trucks, motocycles, joggers, baby strollers and kids riding bikes, emergency vehicles with loud sirens pass by, not to mention airplanes and helicopters over head. Kids are always swinging ropes and running around them. They will be there for atleast 6 months. I hope they will be sane after their training is finished!