Riders who are trotting or cantering should have the right of way on the outside of the track. If you are slowing down or stopping, don't block the rail- move to the inside of the track
This is the only one I sort of disagree with. Where I board if people walking go to the inside the people who are trotting & cantering are stuck on their rail & not able to turn in to circle easily so people walking tend to stay on the rail if they are going the same direction as the people trotting or cantering
If a person is cantering, they should be on the inside. That way, the walk-trotters are out of their way if they need to circle or anything. Also, if a person cantering needs to pass a person walking, it is safer for the cantering horse to the inside, where there is room to move away if there is trouble. If the walking horse were to kick out at the cantering horse, and the cantering horse was on the outside, he'd have nowhere to go. He'd be pinned between the kicking horse and the fence-- not a good situation for horse OR rider.
Definitely call jumps, way before you go toward it! Also, it's important to still keep a watch out for other riders. Just because you call a jump doesn't mean you can push past anyone who might be in the way. People should be out of the way but it doesn't look good to run into a little kid on a pony and say "But I called my jump!"
It is standard to pass left shoulder to left shoulder, but in some situations you need to change that. If you know you're going to circle or know your horse needs more space to pass, you may need to pass right shoulder to right shoulder. Calling which way you're passing is really important. Just shout "inside!" or "outside" and make a definite move toward the side you're passing on so there's no confusion.