Ah, that clarifies things. I've seen many photos of the traffic in the streets of London, and was wondering how such a bicycle-hostile environment would manage to get so many cyclists.

I thought that maybe the metric they were using ("the single largest vehicular mode counted during peak times on City streets”) meant they were measuring how many vehicles of a certain type were passing by. And since in gridlock bicycles travel faster than cars, you'd have more bicycles passing by than cars.