Since January 1, random drug-testing operations have tested 29,500 drivers with 1160 positive test results, compared to 729 drivers out of 34,280 in total in 2013. The illicit substances detected include cannabis, methamphetamine (speed or ice) and ecstasy.

There were also 678 drivers detected with one or more drugs in their system.

NSW Police Traffic and Highway Patrol, acting assistant commissioner Stuart Smith said those numbers were a sad indictment for drivers and motorcyclists on NSW roads.

"More than 1100 drug-affected drivers and riders on our roads is alarming and a sad reflection on the attitudes of some motorists out there," he said.

"One in 25 drivers caught on drugs is appalling and to have nearly 700 of these drivers test positive to having multiple drugs in their system should serve as a shock to the community.

"Those that use drugs and then drive need to understand that we can be anywhere, anytime, right across NSW conducting Random Drug Test operations.

"As the year ends, and with a busy holiday period ahead, we are urging drivers to not take unnecessary risks on the roads and remain safe so they are able to enjoy this time with their family and friends." Minister for Police and Emergency Services Stuart Ayres said it was important to understand the effect of driving while under the influence of drugs.

"The message is clear," he said.

"If you get behind the wheel after taking drugs, you will be caught. Not only are you putting your own life at risk with such reckless behaviour, but also the lives of others."

Minister for Roads and Freight Duncan Gay said safety on NSW roads was the number one priority and the NSW Government was serious about reducing drug driving on its roads.

"We will be stepping up the right to remove this behaviour from our roads and help save the lives of innocent motorists endangered by the idiotic actions of drug drivers," he said.

"I've asked the Centre for Road Safety to develop a package of works to target this dangerous behaviour and make our roads safer."