The speed limit on Picton Rd will be slashed to 90km/h and point-to-point speed cameras will be installed as authorities move to cut the road's shocking death toll.Police and road safety advocates have welcomed the measures, which Roads Minister David Borger announced this morning.But the changes have drawn anger from the Transport Workers Union which predicted that they would lead to more reckless driver behaviour.The speed limit will be cut from 100km/h to 90km/h on Picton Rd between Mt Ousley Rd and the Hume Hwy from November.Point-to-point cameras, which measure the average speed of a heavy vehicle over a stretch of road, will be erected to crack down on truck drivers who flaunt the speed limit.The reduced limits will be reviewed after road works are completed in 2013.The notorious 27km route has been the scene of 22 deaths over the past decade and is one of the nation's most dangerous roads.Nine out of the 10 deaths since December last year have involved head-on collisions.The State Government had been under enormous pressure to stem the toll, and in June committed $25 million in safety upgrades in addition to a $15 million program of work already underway.Camden police commander Chief Superintendent Peter Gillam welcomed the latest moves."Crash data research tells us the higher the speed, the more likelihood of serious injury, so reducing the speed limit will have an effect on that," Mr Gillam said.Point-to-point cameras would help control driver behaviour at all hours of the day, he said."We have finite resources in regard to highway patrol - this will be a constant road safety measure whether highway patrol is there or not."The Road Safety Foundation's Mark Arena said the speed limit cut was well overdue."It will save lives and make for a much safer road," Mr Arena said."Motorists still have to be very careful because of the mix and volume of traffic, but if they abide by the speed limit and maintain vigilance, I think there will be a reduction in crashes."But Transport Workers Union South Coast and Southern branch secretary Richard Olsen criticised the measures, describing the notion that speed limit cuts improved road safety as a "fallacy"."It will be no more than a total frustration to truck drivers that the speed limit is reduced … in areas where it was quite comfortable and efficient and very safe to do 100," he said."It's just another inefficiency to moving product around NSW, for no gain in safety."Point-to-point speed cameras targeting heavy vehicles could encourage poor truck driver behaviour, Mr Olsen said."A small minority will at the very least attempt to speed up in areas where they can and slow down remarkably in areas they need to," he said.Mr Olsen called for more median barriers and the creation of a divided dual carriageway.