Centralised discussion space for TfL plans and cycling in London

The officers are also being put under pressure to deliver schemes quickly, at low capital cost. So I think we can afford a bit of generosity.

Sure, as I said, many aren't very experienced in such schemes. However, the principles I propose can be implemented very easily and cheaply.

But the Oval LTN exhibits some of the problems you highlight - filters in the middle of the triangle would have been better than ones along the A3, except that filtering along the A3 has improved safety on CS7 by eliminating traffic turning accross the cycle lane. If they want to keep the A3 exits open, and keep the CS7 safety benefit, they'll need to make the re-opened junctions traffic light controlled - and they don't have any money for that.

No, that wouldn't be necessary. Just move the filters back into the cell. You'd have a minimal amount of side street interaction, but nothing that's problematic for cycling. Filtering takes care of almost all turning crashes along main streets, even if people ride in the gutter, etc. In fact, you need less signal control with filtering if it's done right. As an example, the London Bus Priority Initiative of 2001 and following years hugely increased the number of traffic signals because they didn't filter anything and were worried about side-street motor traffic getting in the way of buses. They addressed the symptoms, not the causes. If it's only a bit of resident traffic and deliveries going in and out, there's basically no issue for heavy infrastructure (although, of course, there's an industry in whose interest it is to put lots of expensive stuff in).