SFAIK Specs cameras, apart from looking very distinctive, (A box with two smaller boxes attached, one each side) don't flash - they work with infra red light.
ANPR cameras look, broadly like this
tinyurl.com/6x2omux
and SPECS cameras look like this
tinyurl.com/62b7yeb
Note the distinctive L shape of the gantry and the Logo int rt angle ben of it = Looks a bit like a motorola logo
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