Civvy Scum
MIA
As part of a maintenance scheme, comparatively it ain't cheap. Hire cost is typically around £100k for 6-8 camera poles for 10-12 weeks. Which can be a fair old percentage of the cost of a £1-3 million pound scheme. Hence why you only tend to see temporary cameras on Highways England schemes and not local authority ones.A blue light incident on the strategic road network is typically valued at £1m in government literature.
A good enforcement scheme actually generates very little money, as compliance is very high. You're absolutely right, there.
So, arguably, putting the cameras in saves money. A moment ago you were saying that this kit ain't cheap.
As a permanent, bought installation that will be there for 20+ years the cost over those years - peanuts.