The 5th amendment with regard to self-incrimination only applies to criminal cases. When I represented myself in court for a speeding ticket the judge threatened me under pain of contempt that I had to testify against myself.
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.
Read the ruling. The judge says red light camera cases are quasi-criminal in the way they are handled even if nominally civil and thus can be subject to constitutional requirements including the protection of the 5th amendment.