Steve,
I've never seen a pit-lane speed limit applied at a meeting where mandatory pit stops aren't required. I believe there is a something in the regs about driving at a reasonable speed, although I haven't heard of anyone being pulled up for breaking that, and generally I think most people are sensible about it. You are right, without a speedo or custom built device the driver would have little idea of his speed in terms of miles per hour, although his judgement of what is safe could still be applied.
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