Pittsburgh / Allegheny county does have a habit of ambiguous demarcation. Super wide streets that are single lane (some stretches of Butler, Wilkins, and Schenley Park all come to mind), streets that are super narrow but marked two lanes (under that bridge on Washington Blvd is one), and then the number of lights at intersections is seemingly unrelated to number of lanes (two lights for one lane, two lanes, three lanes...?).
Independent of jagoffs who want to get there faster than the traffic will allow, some consistency in lane widths and marking would only help. I get the feeling that sometimes, just like way-back-when we paved the paths that people were traveling with out any kind of planning, we now paint the lanes that people are using with out any kind of planning. Or not paint them.
I'd heard rumors that the state roads have a set of standards, and I believe the city has some too... I'm just not confident they are implemented 100%, and if they are, they're not rigorous enough, because there's too much variation to be predictable.