I'm not subject to OSHA rules. I wander around roofs up to 6/12 pitch with no harness. 7/12 pitch and up I have roof jacks, still no harness unless it's a two story house. I don't do much roofing since the aneurysm however. My balance hasn't seemed 100% ever since then, plus I tire easily.
The pitch of that roof is 1-2/12 pitch.