None of the 150 mobile speed cameras the RTA unleashed on NSW last week will enter Wollondilly Shire.

Wollondilly councillor Judy Hannan said she did not understand why the road missed out.

``Surely with a bit of sense they would see they should be used on Picton Road,'' Cr Hannan said.

In the past decade motor vehicle accidents on Picton Road have claimed 24 lives.

Cr Hannan said she had seen the cameras around Narellan Road, but she doubted there were as many crashes and fatalities on that road as there were on Picton Road.

Councillor Shane Read said Wollondilly Shire had ``missed out yet again''.

``Myself and Cr Hannan have been campaigning for flashing lights or signage on the road, but it has fallen on deaf ears,'' Cr Read said.

The lull in fatalities on the road since the state government's funding package may have lured authorities into a false sense of security, he said.

``There is a spate of road fatalities and then a lapse of about six months, but we know once it starts raining again there will be more fatalities,'' Cr Read said.

He said on average police clocked 80 people a day speeding past the Wilton turn-off, and the mobile speed cameras might make drivers think twice.

A spokeswoman for the RTA said the locations for the cameras were based on a criteria developed with the help of NSW Police and the NRMA.

``The criteria are primarily based on crash history and the initial locations have been selected from those previously used in the NSW police force program,'' she said.

``The NSW Centre for Road Safety has reassessed these locations and prioritised those that have been identified as having a high number of crashes.''