I agree that training should be the first priority, but safety is number one. And not all horses are the same. We do a lot of trail driving with several horses. 2 or our horses are fine and we do not use any checks on them while on the drives. We have one that is relentless. He is busy with his head all the time. In the arena, in-hand work, and on trails he is terrible. We do lots of correction and this helps. BUT....if he wants a little blade of grass, he will not easily be persuaded. When he's on the frisky side...I would NOT want to be smacking him at that time while driving. Went out once this last year w/out a check, it was miserable. We were on a scavenger hunt with our driving club and were doing frequent stops. Although not lots of grass at that time, he was constantly on the "look out" for that one blade of grass. By the end of the drive and fighting him, he became dull and non-responsive, which is what happens when constantly fighting one. I never go out with this particular horse w/out a loose side check. He corrects himself once or not at all and we all enjoy ourselves. In my book....safety first. Yes, train at home and correct. Some will be just fine to this and no check needed. But the thought of going down a busy road where grass is growing beautifully and me smacking my horse is not what I'm going to do...especially with a frisky horse going out for their first Spring drives. Just my opinion. Yes, Yes train and be consistant...but please don't sacrifice safety either.