^^Its not illogical for someone to think a two lane means two lanes in the one direction, it’s just not correct. It’s not really a math equation, it’s just counting and definitions.
If someone was telling a story about what happened on a highway they might say, “I was driving in the second to left lane on a four lane highway, and the guy in the left lane cut me off to exit…”. The story is about the four lanes in one direction the story teller is driving in, the road is technically an eight lane, but people state it incorrectly.
The story teller should say it was four lanes in one direction, but they say instead four lane road, and might even think four lane road is correct terminology. I personally think in terms of how many lanes are in one direction, but I just know the proper definition.
When I’m driving I care about how many lanes in one direction. Is it one lane, and if I get stuck behind someone going very slowly I’m screwed? Is it 3 lanes so I can ride in the middle without passing, but don’t have to deal with lots of people entering and exiting? I think in terms of the lanes in one direction.