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Actually, I use the safe speed rule only where it's on the "critical path". How fast I'm going (subject to remaining legal) often depends on how far I can see and how quickly I can complete my scan. I don't feel safe unless I can drive at least ten seconds ahead of myself (i.e. scan up to at least where I'll be in ten seconds).
I use it much more. How fast I'm going is almost entirely iterative. It is for that reason I likely use much more fuel than other "press on" drivers. Not proud of that aspect, but when I get a hybrid with regenerative power under deceleration or light braking I will be as economical as my colleagues who presently decouple a lot of my varying speed in similar situations. Byh way of example, I find several of my colleagues "max out" at perhaps 50 on country lanes even when straight as far as the eye can see with good left/right visibility and in light traffic, yet are doing almost the same speed on bends with such poor visibility and limited prior chance of assessment that I'd be unlikely to take at over 30.
As for 10 seconds.. that's a fair open road time, but in the town centre with lots of people about a scan may be repeated 3-5 times in that window of time, with barely time to assess things more than 1-2 seconds ahead. That's second gear speed feathiering the brake for me.