Min is about 120 M for parallel operations in Vis 1.
There have been some incidents where an airborne aircraft turned towards the landing runway. I recall one at Heathrow where {I think so don't flame me] a BA 757 turning left off 27 R was in close proximity to a go around off 27 L. It's in the AAIB reports.
Last edited by Dave Gittins; 23rd Jul 2019 at 12:33.