Caterpillar

I wonder what sort of caterpillar ia this. It must be from the moth family. I came across it on the Bukit Mertajam Hill trail a few days ago. It was large - about three inches long - and it had such a brilliantly red hue. It was wandering about openly and going quite fast too, but I doubt any animal would dare to eat it or even touch it. It would make for a great itch!