Officers from ACT Policing and NSW Police will target speeding, impaired driving, seatbelt offences and driver fatigue from Saturday to October 6, as part of Operation Snow Safe.

Traffic operations station sergeant Rod Anderson said large numbers of motorists would travel through Canberra on their way to the Snowy Mountains in the next few months.

"If nothing else, the increase in traffic volume is enough of a reason to slow down and take it easy," he said.

"We'll be carrying out high-visibility patrols on major roads in and out of the ACT leading to the snow.

"It will be at all times of the day, because we know people often travel to the snowfields after work, or they leave early to get back to Canberra for work."

Police will focus their efforts on the Monaro Highway, Federal Highway and Kings Highway, as well as rural roads that lead to the Brindabellas and the northern section of Mount Kosciuszko.

Sergeant Anderson reminded drivers to obey speed limits, take regular breaks and stay patient in heavy traffic.

Drivers faced with high winds, fog, snow or ice should drive according to the conditions, ensure their windscreens are clear and know how to fit chains to tyres.

NSW Police inspector Greg Lynch said inattention, fatigue and speed were dangerous for drivers, particularly in wet and icy conditions.

"All motorists need to ensure they are well rested, focused and prepared for travel in the conditions before setting out," he said.

Double demerit points will be in place for speeding and seatbelt offences during the Queen's Birthday long weekend.

Police will also conduct extra roadside alcohol and drug tests around the capital.

There were no deaths or crashes causing serious injuries during the June long weekend in the territory last year.

Six people were killed on NSW roads.