Thread: 20mph is just the start.
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Old 01-10-2023, 00:32   #79
OLD BOY
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Re: 20mph is just the start.
Quote:
Originally Posted by spiderplant View Post
It's true. Let's do some sums...

I'll use metric to keep it simple, but feel free to convert to whatever units you prefer.

Firstly, 30mph (48km/h). Now I'm sure you're a sensible driver, and always leave a safe gap from the car in front so you can stop if necessary. The Highway Code tells me the typical stopping distance at that speed is 23m. And let's say a typical car is 4m long. So each car at 30mph occupies 27m of road. So each hour, 48000/27 cars can travel along the road. That's 1778 cars per hour.

Now 20mph (32km/h). The stopping distance is 12m, and cars are still 4m long, so each car occupies 16m of road. Each hour, 32000/16 cars pass. That's 2000 cars per hour.

So by reducing speed from 30 to 20mph, you've managed to get 12% more traffic down the same road.
How do you make out that relieves congestion? Cars spaced out become cars closer together. Have you thought about how much more difficult that is to cross the road?

---------- Post added at 00:29 ---------- Previous post was at 00:28 ----------

Quote:
Originally Posted by Sephiroth View Post
er, I'm the Waitrose shopper. OB shops at ASDA.
No way!!! My shopping is online and Asda is far too unreliable!

---------- Post added at 00:32 ---------- Previous post was at 00:29 ----------

Quote:
Originally Posted by Hugh View Post
The RAC disagree with you

https://www.rac.co.uk/drive/advice/l...ing-distances/

20MPH 12 metres (3 car lengths)
30MPH 23 metres (6 car lengths)

Nearly twice the distance

So you think anyone who supports a 20MPH zone outside a school is sub-normal?
It depends what you are trying to achieve. It’s altogether a bad idea and if you want to reduce accidents, why not just ban cars? Ridiculous!
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