John Rowland wrote:

The first place they should put SPECS is on every road currently blighted
with speed humps, so they can remove the bloody things. Does anyone know the
relative cost of SPECS versus speed humps?

I think they cost more. More to the point, London boroughs can put in
speed humps without involving TfL. A lot more hoops have to be jumped
through to install any sort of camera.

Colin McKenzie