Stop ubers and white vans taking shortcuts down residential streets that are being made unsafe by high amounts of traffic.
I'm not british either, but I understand the culture here is to disparage and discriminate against poor people in a slightly more polite and indirect way.
Fines are discrimination against poor people, got it. They don't have those in wherever you're from?
LTN's are mostly in poor neighbourhoods, this is preventing high amounts of traffic in them.