This problem with the SHIFT segments is well known and was already discussed in the comments section, as well as in the comments of AngryDragon's guide for CSUE roads. AmamIya, please consider the following suggestion or tell us at least what you think about it. As long as this issue exists, it renders CSUE completely useless for me, because what I see when this happens is the complete opposite of eyecandy and perfection. Though CSUE makes an ideal candidate for eyecandy and perfection, it would be just wasted effort in my opinion, if we don't fix this.

So here is the suggestion, quoted from the comments of AngryDragon's guide for CSUE roads:

"I gave a look at the road asset editor and some tutorials. As far as I got it, you can effectively set up only the distance from the center for each lane, so it stays linear for the whole segment. The visualisation is a different story, I see what amamlya did there, that's a neat idea if I may say so.

AngryDragon's idea to reduce the existing two lanes [in SHIFT segments] to one in between, or rather just to have only one lane that is centered on the visible askew lane, is [in my opinion] very practical and workable. I guess it will still be noticeable that vehicles don't drive correctly, but they shouldn't drive through the barriers anymore. It might even look more realistic, because you know, not everybody drives perfectly centered."

Link to the guide: https://steamcommunity.com/sharedfiles/filedetails/?id=1315769349&tscn=1525358320