A new 'TMO bunker' will be trialled on the world stage from tomorrow, including Wales Under-20s' clash with New Zealand and England v Ireland.
The system will allow a yellow card awarded on-field to be upgraded to a red card during the 10-minute sin bin window. A similar trial has been run in Super Rugby Pacific this season, with World Rugby looking to "assist officiating, enhance game flow and advance welfare"
If the trial is deemed a success, it could be used in this summer's senior Rugby World Cup warm-up matches and even the tournament itself.
