New COVIDSafe alerts rolled out on the Opal Travel app if trains are full

Transport customers will soon be notified if their Sydney trains or metros are full before they board.

The Opal Travel app will now send alerts about physical distancing on board, as well as the usual notifications about track work, delays and major incidents.

The feature is only available for train and metro passengers but will soon be rolled out across the transport network.

The scheme is available to both registered and unregistered Opal card users who have travelled regularly over a 21-day period.

Notifications are sent 30 minutes before the scheduled departure time, but can also be personalised.

NSW Transport Minister Andrew Constance said the new feature is a "world leading piece of innovation".

"We have already implemented the green dots across the network, and the notifications are another way we can help maintain physical distancing and keep people COVID safe."

Transport for NSW worked with Amazon Web Services (AWS), Tigerspike, and AppJourney to deliver the COVID Safe travel notifications in 12 weeks.