I tend to code-switch when speaking if I can. If I'm talking to a New Yorker I'll say "truck" and "apartment", but to a Londoner I'd be more likely to say "lorry" and "flat".
What’s the difference for you?
rotary: tangential entry/exit, large diameter, high-speed, multi-lane
roundabout: deflected entry/exit, small diameter, low-speed, sometimes single-lane
Rotary/roundabout
Yard sale/tag sale/garage sale
semi/semi truck/semi trailer/tractor trailer
sneakers/gym shoes
I suspect they didn't have a large enough sample size to allow multiple selections while still having the desired accuracy so they force you to pick something.
"You have a Northern accent. That could either be the Chicago/Detroit/Cleveland/Buffalo accent (easily recognizable) or the Western New England accent that news networks go for."
Chicago suburban for me. I'm actually southwest of the city, but the NY Times quiz heat map puts me in the Buffalo/Cleveland/Detroit/Chicago zone, quite rightly, but different than the city proper. Before a certain Saturday Night Live sketch, I never said "Da Bears," ever, so I don't have the South Side accent which that parodies.
Of course, even in that range there are differences. Most Chicagoans wouldn't know what a "weck" was if it jumped up and bit them (which would be a neat trick, since it's a roast beef sandwich served in the Buffalo area).
The NYT quiz has some judgement calls for me, though, since I use a variety of different terms sometimes (highways being a good example).
This little bit on the Michigan accent (2002) is spot-on: http://michigannative.com/ma_home.shtml
But the NYT one had some that I wanted to select multiple for. Such as "service road" & "frontage road". I selected "service road" but I know that in Chicago where I'm from the term "frontage road" is used but I don't think I personally would use it in a sentence since it isn't intuitive to me.
There were other examples where I wanted to select multiple.
Also never been to Buffalo and don't know what a "weck" is.
There were a few questions were after reading the other answers, I realized that I would have said it differently 20 years ago, but I now say it like the locals.
This one was pretty close, got it down to 3 cities, two of which are in the correct region.
I grew up in the deep south and make Andy Griffith sound like a northerner.
I assume it's because this quiz is only asking about how we pronounce words, and doesn't measure any other speech metrics like tempo/cadence. I guess I don't have the drawl, but still pronounce words with a Southern accent. Maybe this is why it confuses me so much when my wife pronounces Don and Dawn the same, which was question #2 on the quiz. ("Wait, which person are you talking about?!")
Maybe you have the drawl but not the Southern pronunciation?
I expected my result to be near the Mass area due to her influence, but somehow I ended up near Kentucky/Tenessee. I wonder why?