I hope one of Transport for London's New Year Resolutions is stop putting in expensive and pointless facilities like this one. It's just appeared at the north end of Blackfriars Bridge.
It's a short length - maybe 20m or so - of separated cycle lane. Just after the lights, it rejoins the road, merging with the traffic that's turning left. The lights have three phases: (1) red for both bikes and cars; (2) red for bikes, with a green left filter lane for cars (right); (3) green for bikes and general-green for cars (below).
Now, even if you have a Hogmanay hangover the size of Southwark, you'll spot the flaw straight away. What possible benefit does this separated lane offer cyclists? When the bike signal is at red, traffic is turning left in front of you. When the bike signal turns green, you still have traffic turning left in front of you.
In other words, all the signal does is (a) hold you up, and (b) offers no safety benefit. It's useless. No wonder every cyclist we saw simply ignored it and rode through red (below). By doing so, of course, they're at risk from left-turning traffic in front of them - just as they are if they wait for the green.
In fact, it's worse than useless. Not only has it wasted money, it also encourages cyclists not to use the cycle lane, but go on the main part of the road with the traffic and go through the left-filter. Which drivers won't be expecting, of course, even though it's perfectly legal, and they'll and shout and complain and resolve to run over the next cyclist they see.
Integrate cyclist with main stream of traffic, or build a segregated Dutch-style system? It's one of the big debates of the moment. In London, all attempts to do the latter have failed miserably. By contrast, all attempts to the do the former have failed appallingly.
Which side am I on? Whichever side has the green signal.