I'm not actually measuring square mile that is being figurative.
What actually matters is that as you can see, the inner London boroughs with these marvellous "superhighways" are some of the most dangerous places you can ride a bike in the UK. And that's with people being terrified off of cycling them in the first place, let alone if we had a surge of tens or even hundreds of thousands of people giving it a go because they're frightened to use the tube etc. We'll probably see something similar happen with scooters since many are taking to those too. Sacrificed on the altar of the Motor God.
In fact that reminds me. TFL really need to track scooters under their own tab on this map...
That's a logical fallacy. Far more people use the superhighways. I've cycled on the A4020, last time I went into London. It has a trickle of fatal crashes.
I could instead use the A40, which has maybe one or two fatal crashes.
I've cycled on the A40 (Westway) by accident. It's a hellish 3-lane former motorway. By any objective measure, it's far more dangerous than Uxbridge Road.
But, because any cyclists following that corridor tend to use Uxbridge Road, rather than the A40, the A4020 appears more dangerous by absolute numbers.
What's needed is KSI/cycling mile.