[1.9.20] Zip Merging Issue?

[Wolfpig]

from the patch notes
"AI: Only use 'zip merging' for common end intersection"

does that mean that the behavior got reverted back to be more like 1.8?
If not....that happened to me while driving on 1.9.20

I reached the end of a lane on a motorway and had to stop behind a car there and had to wait a few minutes (ingametime on the ingameclock it was 8:41 at reaching and 8:52 before the car ahead of me got into the left lane) before the ai let the ai into the lane. (but the car in front of me stopped as you can see in the picture not at the end of the lane like in 1.8)
http://www.directupload.net/file/d/3568 ... su_jpg.htm
http://www.directupload.net/file/d/3568 ... ua_jpg.htm

(sec-0001+0007);-2654.13;58.1593;30284

I myself had to wait a bit less...but that was only cause the ai stopped on the lane to let me in (should be thanks to the fact that they don't ignore the indication light if no AI is in front of one).

http://www.directupload.net/file/d/3568 ... nn_jpg.htm



I saw the same happening (with less traffic on the other lanes) a few km later where the ai was "standing" on the ending lane.
So, is this an intentional change, was it caused at that area do the lot of traffic or was it just a coincidence?