[ozten]

Are these used in practice? In what regions? In Seattle suburbs, I've never seen a crew wearing any kind of attached harness.

[RankingMember]

They should be, but I also rarely see roofers in harnesses around here on the other side of the country. It's one thing when it's a roofer himself making the (stupid) decision, but a lot of the guys I see actually on the roofs are non-English-speaking laborers basically told to get the job done and not ask questions.