Founder & Campaign Director, 20's Plenty for Us

Rod King 106sc

Rod King

Rod King's activity stream

  • commented on Manchester Found Casualties Falling in its 20mph Areas 2017-03-11 13:02:41 +0000
    Hi Gina

    When you put in wide-area 20mph limits you include many roads where the average speeds are already low. You do this for consistency and because it would be ridiculous to maintain a 30 limit on such roads when “faster” roads had a 20 limit. Reductions tend to be proportional to the previous average, with higher ave speed roads achieving the highest reductions. Hence the inclusion of low speeds roads where you will see minimal or zero reduction tends to dilute the overall average reduction.

    On most 20mph wide-area implementations you get approx 1-2mph overall average reduction in speed. But this is skewed with faster roads achieving up to 6mph reduction. Whilst this is quite different from an isolated and physically calmed scheme, such schemes only reduces speed on that small section of road and endorses 30mph on the rest of the road network. You can see our comparison at

    You are correct in considering that authority-wide 20mph limits are far more about setting a social consensus rather than traffic management. The crude sort of analysis conducted by Manchester City Council makes no allowance for this and is critically flawed. See my blog on this at

  • commented on A Call for Safety Camera Enforcement of 20mph limits 2017-01-06 10:45:17 +0000
    Thanks for your comment Peter. I would suggest that a more appropriate comment would be “Yes obviously increasing speed makes the impact worse, saying speed is a feature in all crashes is like saying the height is a feature in all fall from height incidents.”

    All limits are flouted, but what that same DFT report, which only measured free-flowing roads, noted was that speeds on 20mph limits were 6mph lower than those on 30mph roads for all classes of traffic. Note that the report only included a total of 9 20mph sites across the whole country.

  • 20mph cuts air and noise pollution to prevent blighted lives

    20mph limits massively cut toxic diesel emissions. 40,000 die early pa[1] from outdoor fumes – 23 times more than in crashes[2]. 20mph is equivalent to taking over half the petrol cars off the road. Traffic noise also blights lives. 20mph halves perceived noise compared to 30mph. We can’t see pollution, yet it affects our physical and mental health. Demand 20mph today!

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  • Isle of Wight Full Council Vote For 20mph limits

    20mph limits have been voted on at Full Council on the Isle of Wight. The 20mph vote was won on Wednesday 19th October.  80% of Councillors supported 20mph for built up areas. Councillor Julie Jones-Evans’ motion called for 20mph limits for “'residential streets, town and village centres, and where people work and learn.”  

    Open PDF

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  • published WHO say 20's Plenty in Press Releases 2016-10-15 09:26:49 +0100

    World Health Organisation say 20's Plenty

    The World Health Organisation’s (WHO) new Pedestrian Safety report endorses area-wide lower speed limits.  It is top level, conclusive proof that signed 20mph limits are effective.  

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  • published Scottish 20mph Default Moves Closer in Press Releases 2016-06-09 10:34:27 +0100

    Scottish 20mph Default Moves Closer

    The first Scottish 20mph Conference moved the debate forward on a National 20mph limit.  20mph was clearly popular amongst delegates from many Traffic Authorities with 95% “favouring a national default limit of 20mph”. Conference-goers agreed 20’s Plenty. The Scottish Government can lead on a 20mph default for built up areas as this is the best value for money in raising everyday road safety and liveability.  

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  • published 20mph As Scotland’s National Limit in Press Releases 2016-06-06 12:40:48 +0100

    20mph As Scotland’s National Limit

    People want 20mph streets.  Fortunately 20mph limits are affordable and do-able. What’s the best method? The Scottish Government can lead with a 20mph default for built up areas.  This is a cost effective win-win all round – eg for the legal process, consultation, signage, engagement, higher compliance and enforcement.

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  • commented on 30km/h 2018-08-08 09:20:11 +0100
    Great to hear that the City of Yarra in Melbourne is trialling 30km/h limits see

  • commented on Cardiff to set 20mph limits across the city 2016-04-12 16:36:35 +0100
    HI Nic

    We would be delighted to help and will make contact by email.


  • One year zone 30 in Ghent city center: rate drops and fewer accidents

    We noticed this report on the success of the new Zone 30 in the Belgian city of Ghent. It may be viewed here but the English translation of the web page follows.

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  • published Ready for 20 Presentation in Blogs 2016-02-26 15:23:04 +0000

    Ready for 20 Presentation

    At the 7th annual 20mph Places conference in Guildhall, City of London, after a warm welcome from Cllr Michael Welbank MBE, I made my presentation on how 20's Plenty/Love 30 is a developing standard for streets. Here is the text of that presentation.

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  • commented on Cheshire East Council to spend £1m telling drivers its not mandatory to go slower around schools and on community streets 2016-01-31 14:40:25 +0000

    Thanks for you further comment. WE don’t actually campaign for all urban roads to have a 20mph limit. We campaign that there should be a 20mph default and that any exceptions should be justified. Hence roads which have excellent segregated facilities for walking and cycling, good treatments at intersettions and crossing would not be difficult to justify.

    Of course “the child you see” is not so much a problem. Often it is the “child you don’t see” that gets killed or injured, or at least frightened. And of course children with a fear of the roads end up having no independent mobility.

    I am not aware of any places in the UK where 20mph limits are being used excessivley, but do recognise that some drivers may feel different. Perhaps it is these drivers that are the reasons why those limits are mandatory rather than advisory.

    Advisory 20mph were allowed in Scotland from 2002, but their experience has led Transport Scotland to say that advisory limits should no longer be used and mandatory limits set instead.

  • published Blogs in Information 2016-01-07 09:48:37 +0000


    The 25mph Conundrum
    Posted by · March 10, 2021 7:38 PM · 1 reaction

    Why not "self-explaining" roads?
    Posted by · February 05, 2021 7:19 AM · 1 reaction

    What is intelligent speed assistance?
    Posted by · January 12, 2021 2:52 PM · 1 reaction

    See all posts

  • published 2015 - The Tipping Point Year for 20's Plenty in Blogs 2016-01-05 08:10:45 +0000

    2015 - The Tipping Point Year for 20's Plenty

    At this time of the year it is traditional to take stock of achievements and progress in the preceding year. For 20’s Plenty for Us then perhaps 2015 will be seen as the “tipping point” when the whole campaign took on new dimensions and success. It does not mean that in 2015 we achieved our aims of delivering a 20mph limit as the norm for all residential streets in the UK, but was the year when we started to see that that aim was going to be deliverable in the foreseeable future.

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  • published 20mph Council Myth Buster in Briefing Sheets 2015-12-04 15:24:01 +0000

    20mph Council Myth Buster

    Whilst many urban councils have pressed ahead with 20mph limits, some County and, particularly Shire Councils have not always told the truth if reluctant to implement 20mph. We bust the common 20mph myths.

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  • commented on Independent Age 2015-11-27 10:12:31 +0000
    Thank you Bob. A perspective from the Alliance of British Drivers is always useful.

    I am sure that other readers can make up their own minds regarding “progress and dogma”.

  • published France expands 20mph (30km/h) cities in Blogs 2015-10-15 09:03:55 +0100

    France expands 20mph (30km/h) cities

    French cities are adopting wide-area 30km/h (20mph) limits with their 30 zones. Here we reproduce a translated page of "Rue de l'Avenir" website who campaign for better a better and more live-able urban environment in France.

    You can view the original page (in French)  here

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  • commented on Campaigning 2018-06-17 11:22:53 +0100
    Hi Jane

    I think that you will find the parking charge issue will come and go. But unless people campaign for lower speed limits then it is unlikely that the consensus change about how we drive in the presence of people will ever change. Waiting for some sort of technical solution will take some time and needs that consensus change.

    Across the country and county campaigns are making a difference and making the strong support for lower speed limits visible to councillors so that they can set the correct speed limits. We will contact you to see how we can help further and also link up with other campaigns in the area, including the Kent wide campaign.

    Best wishes


  • commented on Important new wins for 20mph speed limits in London 2015-10-07 21:36:53 +0100

    Thank you for your comment. However, I would suggest that if you drove 14 miles across London, then unless you were taking all residential roads then very little of it would have been on roads with 20mph limits. I would further suggest that your average speed was not due to the speed limit but due to the number of cars on the roads. You will find data on our site which shows that 20mph limits actually reduce emissions from diesel cars.

    The comment about speed bumps increasing emissions is only where people illegally speed between the bumps. It is acceleration which causes most emissions, plus brake and tyre emissions from braking. Hence this is not a factor in the wide-area 20mph limits without speed bumps that we campaign for.

  • commented on Form a campaign 2016-11-13 17:19:52 +0000
    Hi Luke

    We would be pleased to help. I will email you.

    Best regards