Walking Pedestrians
Runners
Cyclists
Mums with buggies
Latte drinking hipsters
You could devise a Rock-Paper or Top Trumps type game where each has their own agility, velocity, hit-power, hated outgroups, allies, special powers and so on. The most aggressive by far are runners. They literally hate all other groups and will deliberately elbow you in the ribs or push aside anything that gets between them and the new high-score target time.
Buggy mums have a special power of vulnerability, second only to wheelchair users that can, like Moses, part the sea of apologising docile bodies (Everyone in London is constantly "sorry", simply for existing and being in other people's way. But "sorry" is actually a very subtle and British form of "Fuck you").
Cyclists vary between extremely polite and conscientious folks who gently ring their bells and pass single-file in groups... to absolute assholes. How expensive their bikes are more or less directly correlates with abusive behaviour. The optimal bike in London costs about 50 quid and is a fashion item that demonstrates you have nothing to prove. Anyone on a £400 mountain bike is almost certainly a total tosser.
Pedestrians, necks craned, heads down in their smartphones. earbuds blocking out any warning shouts or cyclists bells, zig-zag across the path while reading Facebook or scrolling on whatever dumb new app they have.
And you don't need to be fast moving and dangerous to cause chaos. Hipsters literally sit in the path, man-spreading their legs across the lane, daring anyone to interrupt their beard-stroking and spill their latte.
On a good day this is all a cosmopolitan good natured jossle. On bad day things get violent and people get thrown in the canal.
The point is, that heterogeneous users in crowded transit paths don't work well together. Amsterdam is another good example, but has a different dynamic once you mix-in ten-ton trams. Car drivers are just one more level of removal. With cars on the roads it's life and death, and scores of cyclists are killed every year in London.
We recently changed the Highway Code in the UK to give pedestrians (and cyclists) far higher priority over cars. But, like using phones while driving, nobody pays the least attention, and laws are barely enforced in Britain anyway, which is a good and bad thing.