What you mean is there is so little traffic in central London. Elsewhere traffic levels have risen as people use their cars to move around locally instead of the bus, tram, train or tube. I live in Lambeth and definitely there is more traffic in my neighbourhood than pre-covid. And with second waves etc, it's not going to change, probably it will get worse. Many of these local journeys are made by people who could do them on foot or bike. That would take their car off the road, leaving more space for someone who has no choice but to use a car.