Port Augusta Police have had a highly visible presence on the roads at night time this week.
A total of nine drug drivers and two drink drivers have been detected.
Yesterday, a 47-year-old man blew 0.196, almost four times over the legal limit.
He was reported for drink driving and issued with a 12 month instant loss of licence.
His vehicle was impounded for 28 days.
A 25-year-old man had a blood alcohol reading of 0.087 and was reported for drink driving.
He was issued with a six-month instant loss of licence and his vehicle was also impounded for 28 days.
Both drivers will be summonsed to appear in court at a later date.
Police will continue to be highly visible on the roads this weekend as part of a state-wide traffic operation focusing on the Fatal Five – those five high risk behaviours that contribute to death and serious injuries on our roads.
The Fatal Five are speeding, drink and drug driving, seatbelts, inattention and dangerous road users.
With the states road toll sitting at 14, police are urging motorists to take care on the roads – especially this long weekend.
Police will be paying particular attention to roads and highways that carry high volumes of traffic and pose a greater risk of high speed or significant crashes.