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An interesting one in Ball's Pond Road just east of the Mildmay Park junction. The eastbound lane was barriered off and only the two westbound lanes open. There was clear 'Road closed' signage facing west. I thought that meant the eastbound direction was not available; rather, what happened was that drivers drove eastbound along the outer westbound lane and the other westbound lane was used, well, westbound. I didn't get too close a look, but I got the impression that this wasn't as intended.
Hm, I've never looked this up before and can't find anything with the first couple of searches that come to mind. The arrangement must be subject to a traffic order, and this must have been made by the highway authority, i.e. the City (e.g., the bus stop is clearly closed). I'm not sure why they may have thought this acceptable when roadworks of this size would have much more elaborate arrangements around them. I doubt it was set up incorrectly.
Setting up temporary traffic management measures is more difficult if large vehicles have to access the space around which you might want to manage traffic, but you mainly have to make a longer site. I suppose it may in part be because of Bank junction being partially filtered and there not being as much through motor traffic as there used to be, but yes, not a good arrangement. Hope you get something sensible back from your query.