POLICE have warned motorists about the dangers of wet weather driving as winter fast approaches in the Southern Highlands.

Sergeant Dave Black, from the Mittagong Highway Patrol, says he has one simple message for motorists contemplating driving in adverse weather conditions - slow down.

Following the death of an 18-year-old man in Moss Vale in the early hours of Sunday morning, police are reiterating their safety message to motorists, as road conditions look set to get steadily worse.

"We're appealing for all drivers to take extra care and slow down when driving," Sgt Black said.

"While road conditions are getting worse in the wet weather, another area of concern is the early morning fog common in the Highlands which many people find surprising.

"And later on in the year, there will be the arrival of black ice which is impossible to see and is just like skating on glass.

"Visibility is also reduced in fog so it's doubly important that drivers slow down and keep their distance from the car in front."

Sgt Black said Southern Highlands police had accustomed themselves to the yearly series of prangs which traditionally blight the arrival of winter.

"No, we're not surprised as it happens every year, I suppose if anything we are more disappointed as it doesn't appear that motorists are getting the message," he added.

"Recently released statistics have shown that May is the worst month of the year state wide for fatal motor vehicle accidents, which is another important area to bear in mind.

"Another thing to look out for when driving is for wandering stock.

To coincide with the arrival of winter, police are stepping up patrols and promising that more officers than ever will take to the regions roads.

Operation Westsafe will continue to run in the Southern Highlands, while from June 7, Operation Snowsafe will also be in force on Friday and Sunday nights with the emphasis of ensuring safety during the snow season.

All police leave has been cancelled during these two operations in an effort to ensure the maximum number of Highway Patrol officers are on active duty giving a visible presence for motorists.