Acting Sergeant Tim Coudret, of Mosgiel, said a team of police posted on the Southern Motorway (State Highway 1) at Fairfield had caught at least a dozen drivers flouting the speed limit in about an hour yesterday afternoon.
"Overall, police are pretty disappointed with the speeds — people need to remember that it is holiday season, so they need to take a bit more responsibility," Sgt Coudret said.
For the holiday period, police would be out in force making sure drivers were sticking to the speed limit.
Yesterday on the overbridge at Fairfield, the slowest driver they had caught speeding was driving at 112kmh, while the fastest had been driving at 125kmh, Sgt Coudret said.
Those drivers would be liable for fines of $80 to $170, depending on their speed.
The tickets served as a general reminder for all vehicles to slow down during the holiday period.
"Police will continue to enforce the speed limit, especially for the summer busy period," Sgt Coudret said.
Police would also have an eye out for people failing to use seatbelts, or using cellphones while driving, he said.
Southern district road policing manager Inspector James Ure said a "pretty extensive" deployment was planned for across the region over the holidays.
Impairment teams were also working at a variety of locations and times, so drivers could be expected to be breath-tested at any hour, Insp Ure said.
