It's the same old shell game. In NYC the Wagner administration started shorting road infrastructure maintenance in the 1940s. 30 years of holding off just a bit too long on painting, rust removal, and parts replacements and the West Side Highway comes down in 1973. An unforeseen accident said all the pols with their hands in the road maintenance budget
Today, we move to Chicago and we find that the police are suffering from unforeseen problems with their car fleet. Stretch out maintenance cycles, reduce parts budgets, purchase even a little bit based on the clout of the contractor and this is what you get. It's as predictable as a highway collapse and just as untraceable by the time the disaster unfolds.