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Google Maps tests new pop-up ads that give you an unnecessary detour
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
With gmaps constantly suggesting off-ramp->on-ramp detours at over/underpasses to help you ~~shorten your eta by 1 minute~~ increase merging traffic, I doubt they would have any ethical hesitancy behind it.
Honestly, I imagine they may already have a deal (possibly under the table) with clearchannel and the likes.
I've not seen gmaps taking these kinds of routes. I'm UK based if it makes any difference at all, but I'm always grateful for my route seeming to prefer a smooth choice to the absolute fastest.