It's been a particularly expensive week for motorists in the Far North with two drivers copping hefty speeding fines on the Flinders Ranges Highway.
Just after 9am yesterday, 20-kilometres north of Quorn, police detected a Toyota station wagon travelling 142km/h in a 110km/h zone.
Police issued the 55-year-old driver with a $1,532 on the spot fine.
At 3pm the same patrol was cruising the Flinders Ranges Highway near Hawker, when they detected a grey Volkswagon station wagon travelling 51-kilometres over the speed limit.
The 49-year-old Adelaide man was issued an immediate $1,718 fine and his licence was disqualified for six months.
South Australia Police said: "speeding drivers put other road users at risk as well as their own.
"With the road toll currently sitting at 91 compared to 61 at the same time last year, SAPOL make no apologies in detecting speeding drivers on state's roads."