That sort of thing cannot happen in a corrupt city because people would bribe the cops directly instead of paying or disputing traffic tickets, and the city government wouldn't see any of that money. Such a city wouldn't even try something like that.
Related: https://www.forbes.com/sites/scottbeyer/2015/03/11/fergusons...
If all the available money for fines was being extorted from drivers by corrupt cops, the city would have to get money another way, or cut services. This would likely upset the people of Ferguson even more.
Another way of looking at it is, what wealthy, safe, clean, productive societies regularly engage in bribery?
I also think cutting services can be dangerous. For example, a service to feed the elderly, inspect water safety, maintain roads, deploy police to prevent or reduce crime, after school programs for disadvantaged teens who might otherwise get into or cause dangerous situations, etc.