I am advised:
Speed camera enforcement is one of the most effective, evidence-based measures to reduce speeding, save lives and prevent injuries.
Research and evaluation evidence has established that randomness/unpredictability is a key principle in the effective deployment of mobile speed cameras. A review of good practice regarding mobile speed cameras is publicly available on the NSW Centre for Road Safety website.
Between March and July 2020, while significant travel restrictions were in place for COVID-19, 54 per cent of all fatalities had speed as a factor. By comparison prior to COVID-19, speed was a factor in 35 per cent of fatal crashes for the same period in 2019. During the first 51 days of the current lockdown period, 32 people have died on roads, with speed-related fatalities at 31 per cent.
Pleasingly most people are doing the right thing and more than 98 per cent of drivers who are passing a mobile speed camera are not caught speeding.