I actually rode my first two of these lanes on Saturday. They were Priestgate and New Road in Peterborough, the first of which is shown in
https://www.peterboroughtoday.co.uk...ecisions-made-city-centre-cycle-lanes-3001221
Both lanes were very useful additions for my journey even though I didn't know they were there. It's now possible to cycle across the city centre without risking a large fine, although it is a bit convoluted from the south or southeast (U turn and corkscrew required!) - and of course, none of the Sustrans routes have been rerouted so most (21, 53 and 63) still avoid the centre, except for one (12) that directs you straight into a cycling-still-banned road.
The lanes were pretty wide, with New Road almost a whole carriageway lane (3.7m maybe?) but the bollards on the outside were very close together, so I can see they would cause problems if you wanted to use the carriageway to pass a large group, or to take a turning on the other side of the road. They could have used half the bollards and made it easier to cycle into the next lane but still made it impractical for a car to get in. The money saved could have been used on a few direction signs: on Priestgate, I missed the turning into Cross Street to reach the marketplace at first; and on New Road, I think I missed a cycleway that avoids an oversize roundabout but I'm still not sure if I did.
There's a good discussion of what's happening with the next slice/tranche of funding for these lanes in the Streets Ahead Podcast:
View: https://twitter.com/podstreetsahead/status/1327265031130669056