Dons fans were expecting delays, bag searches and the sight of armed officers ahead of the Scottish Cup Final, after police warned of extra security at the match.
About 50,000 Celtic and Aberdeen supporters will descend on Hampden Stadium in Glasgow for the Scottish Cup Final today.
Security at transport hubs, crowded places and in and around Hampden itself are being “enhanced”.
However, police chiefs stressed there was no specific threat to either Scotland or the Cup Final.
The extra security steps, which follow this week’s terrorist attack at the Manchester Arena, came after the national threat level was reduced back to “severe” following the “critical” alert this week.
Police Scotland Chief Constable Phil Gormley said: “While the decision to move to ‘severe’ is welcome, we must all remain vigilant.
“There continues to be no intelligence of a specific threat to Scotland. However, the enhanced police deployment we have planned for the major events this weekend will remain in place.
“The public should continue to expect to see armed police officers on foot patrol at key locations.
“Our policing operation will gradually be scaled back in keeping with the UK-wide operation – but will continue to be proportionate.”
The stadium was due to open its doors at 13.00, two hours before kick-off, to allow more time for additional security measures to be carried out.
Among the “enhanced” steps are the presence of armed police, greater use of body and bag searches.
Police Scotland will be working closely with the British Transport Police to ensure the reviewed security steps are carried out and that fans get to, and from, the ground safely.