Thanks for your answer but my question was flawed. Actually, what I meant was could the speed of light be variable in the context of space-time. As an observer approaches the speed of light, time slows down. Does that mean the speed of light slows down as well? If time slows down the faster things go, when things reach the speed limit, does time stop; or does time become eternal/infinite?

If the speed of light stays the same relative to an observer going almost as fast, does that mean the speed of light is additive? Does light actually go faster than the speed of light as time slows for the observer approaching the speed of light?

You see my dilemma in not being a physicist.