Mine is probably related to physical trauma. Well, not trauma, but more abnormalities. I have arteriovenous malformations in my brain, around my visual center, and very poor eyesight. The two likely combine in such a way that I don't get/rely on visual information as much.
Conversely, I have very good audio processing. I love music, wordplay, anything with sounds and words.
The most dangerous act while driving on a multi-lane highway is lane changes. When there are entrances/exits every mile or less, I'm not going to merge into the lane that merges with the on ramp, be in the way of people trying to get on, and merge back to the inside in, what, 4 seconds? If I followed that logic, I would be weaving between lanes. Similarly, if I'm in, say lane 3 and actively passing a column of cars, but someone faster is coming up behind - I'm going to merge when it's -safe- to do so. Yes, I could technically squeeze in between two of the cars in the column I'm passing slightly slower than the guy behind me, but that's just not safe. And, if there is a lane further inside, THEY should be merging to get around.
In almost every activity you'll do, there are prescribed "right" ways to do things that usually work, but sometimes require a little bit of an exception. Smooth traffic flow and minimizing dangerous maneuvers is one of those times.