Just noticed this today, haven't seen anything mentioning it. Sorry if it's a repost.
EDIT:
It doesn't seem to pop up all the time, and if so I've never seen any cars show up in adjacent lanes.
Software: 2018.12 5eadc71 AP 2.0
EDIT:
It doesn't seem to pop up all the time, and if so I've never seen any cars show up in adjacent lanes.
Software: 2018.12 5eadc71 AP 2.0