Michigan, I'm willing to change my opinion, but I don't think it has to be specifically part of or within the site (hence the term 'external'). If the site backed a nuclear landfill, I'd check yes. The landfill is not part of the site.
I guess I take the question quite literally. "Are there any adverse site conditions or external factors?"
A busy road creates external obsolescence, adverse noise, and views. Its not quite as appealing as a typical residential site surrounded by other compatible homes with no outside influences.
The question is not external obsolesence, the question is, adverse site condition.
Yes, a busy road can create ext obs, but that is a value issue, not a site physicality issue..
Is there an adverse site condition is a stand alone question (yes/no, then describe). If an adverse site condition also creates external obsolescence, that is addressed in appropriate section or narrative, apart from answering the question a asked
RE, an adverse site issue physically outside the site boundaries...such as site backs up to a polluted waterway or landfill. ( your comparison to road being outside the site)
However, an external environmental,, in addition to adversely affecting value ( ext obsolescence a) also would physically impact the site itself...such as leaching pollution into soil or water supply
That is my opinion...that in the context asked, the UW is right regarding the road (for what report intended use is)
One of the standards is peer standards,...if most of your peers say that no, a busy road is not an adverse site condition, then that is one aspect.