Revellers attending T in the Park this weekend are being asked to be extra vigilant following the failed car bombings in Glasgow and London.
80,000 people are expected to turn up on each day of the event
The music festival, one of the biggest in the UK, will see tens of thousands of music fans heading for Balado in Perthshire from Friday to Sunday.
Tayside Police said it had increased its activities in line with other forces in the wake of the attacks.
Detailed policing plans for the event have been reviewed as a routine matter.
About 80,000 fans are expected to attend the festival each day.
Ch Supt Matt Hamilton, who is in charge of policing in the Perth and Kinross area, said: "As with any large scale event, we would ask the public to remain vigilant and report any suspicious activity immediately to the police.
"Those attending T in the Park will be subjected to searches and we would ask that revellers do not leave any bags unattended whilst at the festival."
Festival goers are also being asked to leave plenty of time to travel to the event.
Insp Kenny Brown, head of road policing for Perth and Kinross, added: "There will be strictly enforced 'no waiting, no parking' areas and any offending vehicles will be removed by the on-site recovery team, with motorists facing hefty fines."
Festival director Geoff Ellis said a full risk assessment had been carried out, as with every year, by an emergency planning team which includes police and medical teams.
"A huge range of risks such as this are taken into account but the details of this contingency plan and our response are confidential due to security reasons," he added.
"Two years ago T in the Park took place on the same weekend as the G8 summit, which meant that our procedures were revised and looked at even more closely and those same procedures remain in place this year.
"As always we will continue to take our lead and advice from the police with the aim of making this year's T in the Park as safe and as enjoyable for fans as usual."
T in the Park has grown massively since 1997, with thousands of tickets selling out within minutes of going on sale.
As well as welcoming 80,000 people each day, this year 60,000 people will pitch their tents in the campsite.
Ch Supt Hamilton urged people to come prepared for all eventualities and weather conditions.
He warned that once again, the force would be adopting a zero tolerance policy when it comes to drugs.
Last year officers made only 70 arrests at the event over the course of the weekend, which was down slightly on the 73 arrests made in 2005.
Of the 70 arrests, only 16 people were kept in custody for court as opposed to 30 in 2005.
Ch Supt Hamilton added: "It was a very successful, very good spirited T in the Park last year.
"Even though we have policed this event for a number of years now, we are never complacent and always make sure that public safety is paramount.
"We are looking forward to policing T in the Park in 2007."