On Feb 4, 12:59 pm, Mxsmanic wrote:
Under what conditions, if any, would you explicitly tell ATC that you
are rolling, that is, actually rolling on the runway for take-off?

I hear this used occasionally, but I don't know if there are any
formal circumstances that merit it, or if it is just at pilot
discretion, or what. It is normally independent of the readback of
the take-off clearance (which precedes it), although sometimes I hear
"Rolling" without a readback of the clearance.

--
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If your takeoff clearance includes "no delay" due to landing traffic
behind you, then the "rolling" information could be of some use to the
controller. However, this is not something that is widely used. I
suspect it is because the controller cannot simply rely on your
transmission for his decision to issue a landing clearance.