This is, in fact, the case in every installation. Signal programming is often turned over to the contract camera provider so the local officials can have plausible deniability.
The caution lights were indeed shortened when the cameras were installed. I travel that road daily.
BTW, there have been more accidents at these camera controlled intersections since being installed. Some have been deadly with the rear ended vehicle forced into the intersection resulting in T-bone collisions.
Safety my arse.