dcbwhaley wrote:
Nor am I. I am taking issue with your unqualified assertion that reducing speed increases fatigue.
I freely admit I don't have data (I don't believe such data exists), but it doesn't invalidate my point. Also, I speak from bitter experience and have the experience of others to support me.
dcbwhaley wrote:
Quote:
80mph on a clear road like a motorway doesn't exactly qualify as 'edge of envelope' stuff does it
No. But it is substantially more tiring than driving at 60mph.
From my personal experience I disagree. There is additional driver stimulation at 80 than 60, but 80mph (for those who choose to drive at it) is not in itself exhausting. It may be for some, but for those people that point is invalidated: no one is forcing them to drive at 80.
Driving at 70 on such roads in good conditions induces fatigue – specifically:
sleepiness.
You need look no further than the report I quoted to see that. Sleep Related Crashes already account for about half of all crashes (A roads and motorways) during the night, not exhaustion, but sleepiness.
Driving at say 100 (not that I'm calling for this) will reduce the onset of that sleepiness. Driving games where people remain well within their limits on straight featureless roads isn't really stimulating and doesn't keep gamers awake at night; does that not count for anything?
Of course, driving faster will also reduce the time spent behind the wheel. Fatigue/sleepiness increases with time, so even one were to say that speed doesn't affect fatigue (at today’s speeds), my overall point still remains valid anyway.
I was once caught within the M1 roadworks with a specs enforced 40 limit during the night (after driving for about 30 minutes, from Milton Keynes). The speed restrictions continued for several junctions (longer than 10 miles). Towards the end of the restrictions I felt disturbingly drowsy (no I was not able to stop or pull over, nor could I anticipate this being as it was my first time). Once the restrictions ended I resumed 'motorway speeds' and was fine all the way to Portsmouth without other any sign of ill effect, even though I didn't stop for a break. Granted some may not experience the same effects as I did, but you have to accept that some do; this is where the problem lies.
When I stated my experience of this on a driving forum (PistonHeads), the responses given were of sympathy and similar experiences, so I know my experience is not atypical.
(oddly, when I did the same on a cycling forum (C+) I was quite literally hounded out of it)
Remember, we're not wanting to force everyone to drive at 80+. Folks who find those speeds excessively mentally exhausting can remain at 70/60; no one else will care so long as they apply the expected lane discipline. We’re all different, everyone should be able to drive what they feel is best for their level of arousal; unfortunately, today’s limits simply don’t cater for that and therefore are
reasonably ignored by a great many.
Does this not demonstrate the problems when talking about speed and speed limits?
People think that everyone is like them. What is a comfortable and stress free to one person would be totally uncomfortable and very stressful to someone else. As was said by someone in another post we all have our own speed for doing things be it reading, painting, cutting the lawn washing the car, you name it. I personally find that on a quiet motor way 85- 90mph is relaxing and comfortable, my wife, 60-65mph would be her chosen speed. Equally the car being driven will have a bearing too on what feels comfortable. So people want to remember that what they feel safe and comfortable at may not feel safe and comfortable to others, which can apply to speeds up or down and needs to be remembered by those setting speed limits.
"What to the novice driver may be a dangerous speed is not necessarily so to the more experience driver. The choice of speed must be related to the driver's ability, the type, condition and limitations of the vehicle and the prevailing road and traffic conditions, bearing in mind that the safe speed for a given section of road may vary from minute to minute as circumstances alter."