Right. Coffee break time
"Over the shoulder" junctions are most often the sort of thing pictured below but I'd include any other layout where people seem expected (in theory or practice) to look backwards and forwards simultaneously, such as on-road cycle lanes that have give-way markings at side-road junctions.
In practice, you have to be wary of on-road lanes that are continuous too, because loads of motorists don't consider cycle lanes as "real" lanes that they need to give way to before moving across. You can tell that Rule 170 doesn't apply in practice when pedestrians are blamed for a collision following a car failing to yield when turning into a side road they were crossing.
My current preferred layout is what's shown under "2. Priority at sideroads (meeting secondary streets)" on
www.MakingSpaceForCycling.org
Being a car length back from the junction mouth means your paths are crossing at right angles and you can see a nobber who won't yield coming before they hit you, so at least you have a chance. In ordinary use, it improves your chances of rolling across non-stop, which outweighs the kink.
We have a few of this style near me (but not quite as good as the second picture) and more are being built this year, some with priority and some without. The first-pictured junction and its similar neighbours to the south are being rebuilt as part of the King's Lynn Transport Infrastructure project but was not improved enough in the last plans I saw, and I think they've overruled KLWNBUG's safety objections due to insufficient funds. I fear when the next collision occurs there, we'll be saying "we told you so" in the media
Where corners are constrained (such as landowner walls right up to the current footway edge - not by shrubs like in the first picture), then the highway authorities simply must do something else if they want to add a cycleway safely. One option is to tighten the radius of the junction mouth, which may free enough space for a kink and also reduces the danger by slowing turning motorists.
I don't think I'd include slip-road crossings because the traffic there should only be coming from behind - but the I think the common designs for those have a whole other bunch of dangerous flaws.
Giving explicit legal force to the highway code rules advising turning traffic (motorised or not) to give way when turning across lanes on their left and when entering side roads that people are crossing might do a lot to make walking and cycling safer.