I know this is probably a really stupid question, but thought I'd better ask just to make sure. My ini file already has those lines (see screenshot) but the 1's are all 0's. So I assume rather than adding all those lines at the end, I should instead just change all the 0's to 1's, right?

Correct, 0 is off and 1 is on.
It's a boolean!

Yupp, as others ninjaed me, just change them to 1:). Sry I was on the way home.

I think I figured it out. And it is mod related. And it was the last mod I added, which was later than all the others (although I have been playing with it for some time now, just not as long as the others).

I remembered where it happened this last time, and just now, as I got to the same place, I noticed it was where one of the hold markers was, which a mod places. It didn't crash (or end) this time, so when I got near where it happened last time I began looking closely at my surroundings and realized the hold marker was there and then remembered I did add that mod much later than all the others.

Not 100% sure, but boy it would explain some things since it seems like every time it happens it's when I'm travelling on a road, and the hold markers are placed along roads.

Actually, I believe that would not be possible.

According to:
http://www.computerworld.com/article/2513110/data-center/scientists-calculate-total-data-stored-to-date--295--exabytes.html
the internet was at least 295 exabytes in size as of 2011, and that number can be safely assumed to be growing over time.

A zip file can "only" store 16 exabytes, according to Wikipedia.
[url=https://en.wikipedia.org/wiki/Zip_(file_format)#Limits]https://en.wikipedia.org/wiki/Zip_(file_format)#Limits[/url]