When did Lego switch from 4 to 6 stud width of Windscreen? All my old sets have cars with windscreen 4 studs wide. No matter if it is a jeep, truck or what - cars was 4 studs, usually 3823 or 2437. Now, in most modern sets, car windshield is usually 6 studs wide, like 92583.

I'm interested when this transition happened. If it's possible, I'll be also glad to hear why - was this change caused by introduction of other bricks? New "series" of a City theme? General overhaul?
I noticed this, too. But only after the "Speed Champions" came out a few years ago. (I didn't give much attention to CITY.) It seems to me like the LEGO Racers got wider, more detailed sets starting from 2008 or so.

Also: I often check the Bricklink inventory part page (example: 92583), to find the Years Released under the "Item Info" section. I cross reference those dates with the list of sets that an item was used in.