UPDATE: 5.30pm, June 10
A Melbourne teenager has become the fifth driver to be caught speeding in the Wimmera on Monday alone, the last day of Victoria Police's Operation Regal.
Northern Grampians police said officers were on the Western Highway Great Western when they detected the 18-year-old from Tarneit travelling at 139 km/h in 100 zone.
"The P1 licence holder received a $604 fine and his driver licence will be suspended for six months," police said in a statement on social media. "He denied the offence by stating he had his cruise control on."
On Monday morning police leading Senior Constable Karyleen Hately said police had issued four motorists with speeding fines on the Western Highway near Nhill on Friday.
She said one motorist was fined for travelling 126km/h in a 100km/h zone.
IT has been a busy long-weekend so far for police across the region.
On Sunday morning Northern Grampians police nabbed a 46-year-old Great Western man at 140km/h in a 100km/h zone on the Western Highway at Dobie.
The man was fined $604 and his licence was suspended for six months.
Donald police have so far given out four penalty notices for speeding drivers, reaching speeds between 127km/h and 130km/h on the Calder Highway.
It comes after St Arnaud police caught seven speeding motorists in the space of eight hours on the Wimmera Highway on Friday.
Station commander Sergeant Bill Alford said five of the motorists were caught speeding between 15 and 25km/h over the 100km/h speed limit.
Victoria Police's Operation Regal will run until Monday night.
During last year's operation, Horsham Police Service Area officers nabbed one drink driver, three drug drivers, and 38 speeding drivers.