victoriacity
commented
4 years ago Spawning of junction medians is controlled by the traffic light flag. Whenever there is no traffic light in an intersection, the median will be spawn.
The TMPE team is working on making the generation of junction medians consistent with the intersection lane connector. You can also check out this mod https://steamcommunity.com/sharedfiles/filedetails/?id=2104976832 to see whether it works for your intersections.
When I build an intersection between 2 different types of roads (in this case a T with 4DR and 2DR) and I remove the traffic lights, the intersection change to become a one-side intersection (see the image below). With traffic lights, the intersection is correct, the intersection is drawn and crossings are drawn too, but not when I remove traffic lights.
Moreover we can't switch off traffic light with the in-game tool, I had to use TMPE11 to do it.
Edit : testing it more, it seems that the 4DR is the cause of the problem : T intersections are not visually available ?