ACT Policing says it will be focusing its efforts on under-age drinking over the Australia Day long weekend.

Station Sergeant Jo Cameron said staff would be working closely with event organisers and security to ensure people could enjoy the Australia Day events while keeping antisocial behaviour to a minimum.

''Enjoy the night, we're not the fun police, we're just here to keep it safe for everyone to enjoy,'' she said.

The number of young people caught drinking illegally at the concert over the past three years has fallen.

In 2011 police said they apprehended more than 70 juveniles for under-age drinking at the Australia Day Live Concert. Since then the numbers have decreased steadily, after about 40 young people were caught either intoxicated or in possession of alcohol in 2012. Last year, just four young people were taken into custody for intoxication and one juvenile taken in for common assault.

Sergeant Cameron said police wanted to ensure this year's concert was another low one for arrests. ''It's pleasing that over the last few years, as we've targeted this behaviour early on in the night and got the message out there, people are being responsible,'' she said.

Double demerit points will also be in force over the Australia Day long weekend.

Drivers who exceed the speed limit between Friday and Monday could lose from six to 12 demerit points, which might result in the suspension of their licence.

''Road safety is always important, but at times such as this, when many more people are on the road, we all should pay extra attention to driving safely. Don't let fatigue or reckless driving ruin this holiday weekend for yourself or others,'' said acting ACT Attorney-General Joy Burch.