Speed enforcement, specifically by camera, is only about making money.should first focus on getting people to drive like humans in traffic then go after the casual speeders.
They wont though, as one is more profitable than the other. Let no-one tell you that the safety of the people using the roads is the metro departments first priority.
In the UK they took the traffic authorities to court and compelled them to only place them at accident spots as well as making the cameras easily visible.
Normally, here and elsewhere, mobile and fixed cameras are placed based on how much they can earn at a location rather than any safety concerns.
And the UK has found that lower speeds and getting people to drive at those speeds has not reduced the road deaths. If we want to reduce road deaths in South Africa we need better trained drivers and vehicles in proper working order.