Two park-and-ride facilities will be the only points of entry for spectators attending the Ryder Cup at Celtic Manor in Wales later this year.
Land at the former steelworks at Llanwern will be used to accommodate up to 12,000 cars travelling from the east and Tredegar House will provide space for up to 3,000 cars arriving from the west.
Both sites will include facilities for security and ticket checks before people take coaches to the event.
"We have based the plans on our experience of previous Ryder Cups at The Belfry and The K Club," said Ryder Cup director Richard Hills.
"Security has to be our top priority, but we are also very confident the arrangements will ensure spectators enjoy their Ryder Cup experience while minimising disruption for those going about their normal business.
"The event will be a sell-out, which means we will have up to 30,000 people a day going through the two sites and we want every single one of them to have a great time."
Traffic pressures on the first day of competitive play - Friday, October 1 - will be offset by a reduction in local car usage as a result of Newport schools having inset days.
It has also been agreed that no maintenance work will take on the M4 in the month before and after the Ryder Cup.
The ticket ballot closes at midnight this Wednesday, while hospitality packages are still available.
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