It was one of the questions in the Driver CPC thoery test, never heard of it before. I've learnt what it means now, Its used in automatic vehicles when a gear is wished to be retained for longer before the gearbox changes up a gear
Hmmm well I could be wrong lol, I asked a friend of mine who's a trucker but he could be wrong. I've got my arctic driving lessons this week I'll ask the instructor and see what he says on the subject