This is the 'inspiration':
Stuck at a level crossing? Turn off the engine or pay £20 fine
Thing is, if you are not in Prius or snazzy Beemer, when is the right time to switch off, and even if there is one (there must be, like for flourescent bulbs) how can it be assessed in advance (ever switched off in a jam afater 5 minutes, only to find that's when it moves off?).
Thing is, I have an old wife nagging that says starting ans stoping uses 'more' (over a period tba) than shutting down.
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