Population density of Manhattan: 78,000 per square mile
(according to wikipedia on both)
The Highway Code was recently updated (a few years ago) to make it more explicit that pedestrians crossing a side road junction should have priority over vehicles trying to turn into the side road. However, that's not necessarily followed by all drivers/cyclists etc.
Basically, drivers/cyclists are expected to make all efforts to avoid a collision and will be considered at fault unless it's a scenario where the pedestrian steps into the road without enough time for the driver/cyclist to react and avoid them.
The City of Westminster has a day-time population of around 1 million people, and its area is around 8 sq miles; (doing casual searching).
In situations where there are a lot of people at the same time, like say a music festival or a sports game finishing, the police tend to manage the flow of people.
One good way to avoid posting meaninglessly is to write meaningful sentences and explain your conclusions/inferences explicitly.
