Lamppost_nav happens the same because of the upper lamps.
The headclearnance doesn't seem to work well for vehicles and this object.
I remember that the cablepole (think its original name) fit for the job as placeholder.
Look that the placeholder touch the ground because the placeholder could have a different anchor point and the simple "Select all of same type and Replace" can cause that the placeholder floats (happens to me, sadlywise).
Cutting down on power lines would be like 50 objects tbh
Remove all filler statics (crates, shelving, etc)
60 shelves or other filler objects more for cover or the sake of good looking ambient more .... sure, shouldn't be focused yet, get the city done but let look at the end for the final polishing.
Removing the BigMosque as excample and having only one of them WITH a basement is also really really nice.
You know, fallujah killer