It's basically "innocent until proven guilty". Red light cameras turn that assumption around since if your car gets ticketed it is assumed you are "guilty until proven innocent".
The judge in this case disagreed, because the red light infraction was not a simple civil fine but quasi-criminal, e.g. points on drivers license, possibly resulting in suspension, etc.
As someone else said, this only works against self-incrimination? If you say it wasn't you then you need to testify or get prosecuted?
Most camera tickets are either civil moving, or civil non-moving. Civil moving are against a person and civil non-moving are against the vehicle. Neither of which case does 5th amendment protect you from incriminating yourself, and neither of which does it require prove beyond a reasonable doubt.