One reason the RTA has for using the "preferred" expensive flashing lights is that they are equipped with a "back to base" fault reporting function.
A necessary feature they say, so that units that break down can for the children's safety be repaired promptly.

These lights are on Forest rd Hurstville and this photo was taken at 2.50pm today a gazetted school day.
This unit has not worked since last Friday.
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http://au.messages.yahoo.com/news/national-news/40122?p=1
Four months and 21 pages of how drivers have been treated by the RTA, lawyers, ministers, courts, or how they have been ignored after being fined at the Beverly Hills speed camera trap.
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The premier Mr Iemma made this speech at the swearing in of the new police commissoner.(Daily Telegraph 4/10/07)
"POLICING IS ABOUT THE EXCERCISING THE POWER AND AUTHORITY IN A DEMOCRACY, IT'S ALSO ABOUT DETERMINING THE LIMITS OF THAT POWER,AND INSURING THERE IS JUSTICE."
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IS THERE JUSTICE HAPPENING AT BEVERLY HILLS?
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See what happens to speed cameras in England.
Will it come to that here?
http://www.speedcam.co.uk/gatso2a.htm
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