It's semi-consistent when it comes to city vehicles like garbage trucks or school buses. What you get is groups of vehicles traveling in a pack, bumper-to-bumpe

It's semi-consistent when it comes to city vehicles like garbage trucks or school buses. What you get is groups of vehicles traveling in a pack, bumper-to-bumper, taking a seemingly random path between bus stops/garbage pickups. At various points in this one or two vehicles will peel off from the pack in a random manner - often towards stops with nothing to pick up. So the aggregate effect seems to be a clump of city vehicles moving randomly around the city, neither towards nor away from places where they're needed, and you're relying mostly on the random "split from pack" behavior to get any real work done.