Many of you here are banging on about GA airports with contra circuits.
Here is a video of Bankstown Airport in Sydney Australia. It has 3 runways (L,C & R). The distance between centrelines of L&R is 213m. Centre is only used in liu of either L or R, the 3 runways don;t work at the same time. One runway is for arrivals and departures and the other for circuit training. Different frequencies for each runway. As an instructor with several thousand hr in thi circuit i always trained my students to spot traffic inthe other circuit and make sure they don;t hit you if they overshot the centrline. Contra circuits to work pretty well if everyone brings their A game.