That research is useless! Sure they measured it, so it isn't wrong. However it is useless. What it is really saying is your city was so bad that people were not taking advantage of living in the city because they couldn't conveniently get places. Those people could have lived in rural Montana for all the good a city did. Cities are about all the things you can do by living in it, so if people change because of new roads then you are a city were not meeting their ideals.
Also note that they measured one lane. I already asserted that by the time a city is thinking about adding one more lane they already need to add 6 times as many lanes (not 6 more lanes, 6 times!) IF your city needs 6 times more lanes than it has, no wonder people are choosing alternates, and once a lane exists they will start using it.
I get tailgated all the time despite being in the right lane . Sometimes I can see that person hang up their phone, finally look and move over. (This was on a rural highway, I was doing 20 under the limit and over 15 minutes 3 other cars passed without issues, which accounts for a 5 cars going my direction in that time)
In the real world when you see .9 you often should round it. You rarely have as much precision as presenting - .5 should generally be seen as 1 unless you have reason to believe the measurement is that precise.
Different bases would have different things they cannot represent as a decimal, but no matter what base you can find something that isn't there.
For real world use base 12 is much nicer than base 10. However it isn't perfect. Circles are 360 degrees because base 360 is even nicer yet, but probably too hard to teach multiplication tables.