Parking behind a mobile speed camera to block its view could ultimately endanger the lives of schoolchildren, road safety experts say.
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The so-called "Block Their Shot" social media campaign on Facebook and Twitter encourages people to park behind a mobile speed camera vehicle to obscure the camera's view of oncoming drivers.
The Facebook page includes numerous photos of drivers faking breakdowns and stopping behind mobile speed camera vehicles. Some photos even show cyclists and pedestrians standing in the way of the camera.
At the heart of the Block Their Shot protest is the claim that mobile speed cameras are simply revenue raisers.
However, according to the Centre for Road Safety, all revenue from speeding offences detected by mobile cameras is directed to the Community Road Safety Fund to support road safety initiatives.
These initiatives include supplying every school in the state with flashing lights to mark school zones by the end of the year.
Centre for Road Safety general manager Marg Prendergast said research showed the flashing lights were effective in reducing vehicle speeds.
But if mobile speed cameras picked up fewer speedsters due to the "Block Their Shot" campaign, there would be less money for flashing lights outside the state's public schools.
Roads Minister Duncan Gay has blasted the practice as "stupid and dangerous" and foreshadowed the possibility of making it illegal. "In the first instance, I've asked the Centre for Road Safety to request this Facebook page be shut down immediately," Mr Gay said.
"If this behaviour continues, I'll have no choice but to ask the department to look at introducing fines for obstructing cameras.
"At the heart of this is a deadly serious issue - speed is a killer on our roads and these operators are there to support the work police do."
According to NSW government figures, more than 99 per cent of vehicles that pass speed cameras are not fined.
The locations of all mobile speed cameras were posted on the Centre for Road Safety website.
Also, warning signs alerting motorists to the presence of a mobile speed camera vehicle are required by law. This includes two signs before the vehicle. The vehicle itself must also be marked.