Six Nations: Thousands in Cardiff for Wales v England
A sell-out 74,000 Six Nations crowd are in Cardiff for the Wales-England clash, with road closures and queuing systems in place for trains.
Cardiff council said it anticipated an extremely busy Saturday afternoon with a heightened police presence in the centre.
The event has prompted a series of road closures.
Arriva Trains Wales said it had put on extra services and capacity.
Motorists heading to Wales faced delays due to heavy traffic at the Severn Bridge tolls ahead of the game.
Cardiff's Queen Street station will be closed before the end of the game to ensure the queuing system at Cardiff Central can operate effectively.
A new barrier system is also being trialled on Saturday for supporters heading to Gates 6 and 7 at the stadium in a bid to improve the flow of fans into the venue.
But supporters were also warned anyone with bags should expect searches and should allow additional time for the security measures.