https://blendermarket.com/products/citigen

Citigen is a Blender add-on.   Watch a simple flat plane(s) you add or edit in Blender turn into a limitless variety of city environments REAL-TIME equipped with streets, traffic lights, trees, and etc–as huge as your RAMs, CPUs, and GPUs allow. The default city props that ship with Citigen will look like a real thing from 10 to 15 feet away, good enough for drone-shot-like scenarios, but you can add your detailed building models to the Citigen library for close-up shots! And even export them as Unreal Engine 5 game level equipped with collisons! (*Citigen-Ultimate version only)   No need for HDRIs, no need for rigging animation cameras for simple drone shots like POI or Course Lock!  And with a few minutes’ tweaking, automatically populate your city with people walking, sitting, and standing; and automatically add cars running on streets, highways, and overpasses!  (*Citigen-Ultimate version only)