I would advise against it, as you are throwing yourself on the mercy of whichever cop pulls you over.
However, with the array of speed fixated numpty's who are incapable of maintaining pace AND observing correct lane discipline, often one has little or no choice.
I would try, where possible, to attract their attention and get them to move over.
I recognise that this doesn't always work, but loud little sportscars are better at this than a hatchback