While many states allow logo signs on urban freeways, some states (even those that do allow them in urban areas) will not post them in areas that are too densely urbanized (such as near downtown areas) due to potentially conflicting with other signs. I would like to know, could you come up with examples of highly urbanized freeways that have logo signs installed?
Interestingly, the massive I-10 Katy Freeway in Houston does in fact have logo signs for most of its length. Does anyone know of some other examples?
In Missouri, I-55 has some in St. Louis about four to five miles south of downtown: Streetview. (https://www.google.com/maps/@38.5808909,-90.2251732,3a,75y,241.58h,89.79t/data=!3m6!1e1!3m4!1shkjAc9JhGP8uCYRHUBrFNw!2e0!7i13312!8i6656!6m1!1e1?hl=en).
I-44 also has some fairly close to downtown St. Louis: Streetview of logo signs on I-44 exit to Jefferson (Exit 289; downtown St. Louis is around Mile 292) (https://www.google.com/maps/@38.6137049,-90.2236667,3a,75y,118.41h,86.85t/data=!3m6!1e1!3m4!1sq7pxOmA_A0q9-CMOVgSSgQ!2e0!7i13312!8i6656!6m1!1e1?hl=en)
IMHO, the urban/rural distinction in regards to logo sign use should be dropped in favor of a more useful measurement such as interchange density/ramp spacing. If there's two or more miles between ramps in an urban area, I do not see why logo signs should not be an option.
I-95 has them at the Md. 152 interchange (Exit 74) in Harford County, north (really northeast) of Baltimore, only the second exit out from the Baltimore Beltway, still a pretty suburban area.
The gas logo sign northbound (https://www.google.com/maps/place/White+Marsh,+MD/@39.4375382,-76.3753479,3a,18.7y,72.47h,90.35t/data=!3m4!1e1!3m2!1so6ZqTZIil2THoQhziDIn7g!2e0!4m2!3m1!1s0x89c7e258d9baca45:0xae000f51d0c8fc6d) is interesting because it has Wawa, Sheetz, Royal Farm and High's on the same BBS panel. Wawa and Sheetz on the same panel is presumably fairly rare.
Exit 166 on I-90 and Exit 242 on I-71 -- both about 6-7 miles outside of the main downtown Cleveland exits.
I-95 and I-10 inside the Jacksonville beltway with the exception of the main downtown exits. But there isn't much in the way of services