I'm saying that the thing that you said here is not relevant to what I said. It's not a problem to the enforcement of amber lights.

Every driver should have an idea of their own stopping distance, regardless of different so-called definitions, so that they can drive at an appropriate distance from the vehicle in front (fat chance of that, given driving standards). If you are 3 seconds away from a light the moment it turns amber and decide not to stop for it, you went through when you were able to stop, and ought to get a ticket. A police car capturing video would be able to determine that objectively. Hence: objective enforcement is possible.