Include redundant in a sentence?

What is the VIN number of a car? Because VIN means Vehicle Identification Number. You do not need to say number again. It is redundant. You could just say, what is the VIN.

The third safety switch on this machine may appear redundant but each one is important for safe operation.

I would consider it redundant if you locked your car doors after locking the car in the garage.

Her beautiful ebony necklace shone against her pale white skinin the moonlight.Not the best sentence in the world but I did answer your question!

I would say that the only thing I could think of for a sentence is like a person says it, like"What are the intermediate directions for?" someone asked.