[Physicist]

Not all motion is relative. Acceleration is absolute.

LOL. As I wrote my post, I wondered whether some lawyer was going to come along and say that acceleration is not relative. (That doesn't make it absolute, either, but that's a longer story.) The poster wasn't talking about acceleration, but about velocity.

[Gary Boldwater]

Now you're calling me a lawyer??!! :)
I'm of the school that acceleration is absolute, relative to only one preferred reference frame. Why doesn't SRT apply to accelerated frames? Isn't the entire cosmos a series of accelerated frames, starting on the rotating earth (in a gravitational field no less) revolving around the sun which is part of a revolving cluster of stars and so on. Even the velocity of light is referred to as local, it is not universal.