....if the red- and green-phases remain the same length before & after adjustment, but just rephased with a delay such each set turn against the main flow before they are reached, then the green aspect on the side-flow remains green for the same length of time as previously....
Yes, that would seem like an act of sabotage. However my understanding - and I should immediately admit that I haven't studied London's traffic signalling system, so I may well be wrong - is that prior to SCOOT, the signals were not linked over wide areas and ran on local timers, so any such act of sabotage would have required constant tinkering to maintain the disruption as the clocks drifted.
Livingstone was quite happy to admit what he'd done at the time, and was done for the reason given. Wholesale too.
Did he go on record? Can you provide a link? I'd be interested to know exactly what he said...
Ask any cabbie worth his salt still working since Livingstone's time in office.
I had reason to travel by taxi quite a bit during recent protracted road works to replace Victorian water pipes in our area. Talking to the drivers, you'd have thought fresh piped water was a curse. Whilst taxi drivers have a right to an opinion, I think it's best to season it with any salt they may be able to spare.