I don’t think there’s an universally understood measure.
Bit like when incandescent bulbs lost favour n halogen n led took over and the brightness descriptions were all over the place.
If they ever truly get to grips with the force available instantly (and I’m mean feckin instantly) I suspect they’ll eventually redefine the laws accordingly.
For example you might only be doing 40 but the time it took to get there could missile style wipe out anything in its path. If you get my meaning.