Contesting smart motorway fine

Actrosman:
Single flash or double? The cameras on M4 e/b approaching j19 (M32) were busy last week…no speed limit in force but they still flashed… on my way w/b I saw a few get it and a few on my way back…me included! I I think it’s just a ‘mind game’…see it go off and everybody else slow down for 50 yards!!

That’s happened to me a few times where they’ve flashed at me doing 55mph with no speed displayed on the gantry. I was told that it may be some calibration sequence that they go through.