Mark Brader:
ObOn-topic version: indicates that none of the next *four* signals is red,
intended to authorize speeds above 125 mph...
Clive Feather:
Next *three*; the fourth can be red: FG, G, YY, Y, R.
Inclusive reckoning? Yeah, that's it, it was inclusive reckoning.
--
Mark Brader, Toronto | "Domine, defende nos
| Contra hos motores bos!" -- A. D. Godley