Ian H
Ancient randonneur
As Mao said (about the French Revolution), it's too early to tell yet.
20 mph speed limit.
- Thread starter gavroche
- Start date
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As Mao said (about the French Revolution), it's too early to tell yet.
toffee
Guru
Alex321
Guru
- Location
- South Wales
No.
No.
No.
IMO, they have actually been surprisingly sensible about making roads exceptions to the new limit, so that most through roads with good width and visibility are still 30.
It makes a little difference to journey times, but not too much in my (very limited so far) experience. I don't think they have started enforcing the new limits with fines yet, though I don't imagine it will be long before they do.
One thing I had already noticed due to existing 20 limits though, is that my car really isn't designed to go that slow. In 4th gear (out of 6), it will be doing around 26-27 without my foot on the throttkle. I have to go down to 3rd before it will be about the right speed with no throttle, and even then it is borderline.
Profpointy
Legendary Member
An exponent is the number something is to the power of. Thus, "to the power of 3" ie "cubic" is exponential
Profpointy
Legendary Member
My car runs best in 2nd at 20mph unless basically coasting in third. (2.3 petrol turbo, albeit a flexible engine rather than hooligan tune)
fossyant
Ride It Like You Stole It!
- Location
- South Manchester
Just lots of Welsh folk getting cross !
fossyant
Ride It Like You Stole It!
- Location
- South Manchester
Found MrsF's car was bumbling along at 1,500 rpm in 3rd at 20. Lumps had to be planned for, both going up and down, as you soon went faster from 'gravity'.
I'll have to be careful on my training routes in places as I am usually exceeding 20 on the push iron, especially with the wind (North Wales Coast).
I'll have to be careful on my training routes in places as I am usually exceeding 20 on the push iron, especially with the wind (North Wales Coast).
Jameshow
Veteran
Your exempt don't you know🤣
- Location
- Inside my skull
In an exponential function , x is the exponent. Thus 3 to the power of x, 12 to power of x etc. In a cubic function, x is base with a max exponent of 3. Quite different.
- Location
- Inside my skull
Gives them something else to moan about, which makes em happy.🤣
Profpointy
Legendary Member
I don't exactly follow your last point.
I followed and agree with the first sentence.
In the 2nd sentence I might quibble with the word "max" as "cubic" means "to the power of 3" so "max" doesn't really come into it
"quite different" I don't understand at all. What is different from what?
OP
OP
gavroche
Getting old but not past it
- Location
- North Wales
If I set my cruise at 22 mph in 3rd gear, it will do it happily and I won't be speeding either.
Profpointy
Legendary Member
Sadly there is some truth in that. Not my fellow countrymen's best trait
Alex321
Guru
- Location
- South Wales
But at the same time, if anything is growing at an exponential rate, that just means any function with an exponent > 1.
- Location
- Inside my skull
No cubic means the max power will be three but powers of 2 or linear may also apply. For instance y = x ^ 3 - 16x^2 + 235x - 42 is cubic and somewhat different to y = 12 ^ x
