An aerosol spray to help referees mark where defensive walls should line up at free-kicks is being used in a FIFA tournament for the first time at the Under-20 World Cup which kicked off in Turkey on Friday.
Referees at the event can use the spray to mark the spot where a free-kick should be taken as well as where the wall should stand 9.15 metres away to prevent encroaching.
Source: timesofmalta
