Founder & Campaign Director, 20's Plenty for Us

Rod King 144sc

Rod King

Rod King's activity stream

  • Scottish Government commitment to 20mph limits supports Active Travel and aligns with global best practice

    With the Welsh government already committed to a national default 20mph limit for urban and village roads, the Scottish Government has announced that it plans[1] for 20mph to become the norm in built-up areas. This aligns with global best practice[2] that 20mph or 30km/h is the maximum permissible speed on roads used by pedestrians and cyclists unless a higher limit is evidentially safe. It is a key component of Scotland’s response to the Climate Emergency and helps to support Active Travel.

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  • commented on Do emissions and fuel used increase with 20mph limits? 2023-08-08 15:50:58 +0100
    Thank you for explaining that Haydn. I am afraid that what you are suggesting is not backed by any of the science involved.

    I assure you that a car can do 20mph in 4th gear. I had experience of a lowly Honda Jazz doing just that. There is evidence that at 20mph 0r 30mph you will get about 90mpg. The difference between the two will be up to + or – 10% depending on exact gearing. See

    “Mr De Nayer said: “There is a huge misconception that the most fuel-efficient speed is around 55mph. The study shows that the slower you go with the vehicle running smoothly, the less fuel you will use.”

    A Citroen C4 1.6 diesel achieved 99.6 mpg at 20 mph, but just 29.3 mpg at 90 mph. A driver of an average car travelling 10,000 motorway miles per year would spend £518 more on fuel than if he had driven the same distance at 60 mph."

    And, of course, CO2 emissions are measured in grms/km. So if the grms/km figure is the same for each then a 20mph car will be emitting only 2/3rd of the grms/second of a 30mph car.

    I am afraid the “real world” is dominated by physics and engineering. To reach 30mph you need 2.25 times the energy to reach 20mph. And in a built-up environment that dominates fuel consumption.

  • 20mph or 30kmh Limits Align With Global Goals

    Setting 20mph/30kmh limits fits with global goals for health, sustainability and the climate. Though at first glance speeds seem to be about roads, actually they are about people and the world we want to live in. Broad and lasting benefits accrue to people and planet from normalising 20mph/30kmh. Climate, safety, active travel, place-making, the economy and quality of life are all helped.  Lower speed limits have wins now and for future generations.

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  • published Our webinar in UNGRSW in UNGRSW 2021 2021-05-08 20:51:12 +0100

    Webinar - Setting 30km/h and 20mph urban limits at national level - 20th May 2:30pm BST

    So many cities, towns and counties have rejected their national default limits of 30mph or 50km/h and set lower limits for most roads. It is not because their roads are abnormal, but because the national limit is seen as no longer meeting the community needs. But that can and is being changed at national level.

    Now that 20mph or 30km/h limit is accepted as the urban best practice norm, we examine the case for setting the limit at national level.  This provides so many benefits in terms of value for money, consistency, messaging and results.

    • Hear how Spain becomes first country to set its national urban 30km/h default in May 2021
    • Hear how Wales is planning a national 20mph default for 2023
    • Hear the benefits from national implementation over city by city
    • Hear the WHO global view on 30km/h urban limits
    • Hear the campaigner view on a 20mph national urban limit
    • Hear the medical and public health case for lower speeds

    The webinar will be chaired by Deborah Sims, Senior Vice President, Chartered Institution of Highways and Transportation

    Speakers already confirmed are :-

    • Álvaro Gómez Méndez, Head of the National Road Safety Observatory, DGT, Spain
    • Nhan Tran, Head of Safety and Mobility, WHO
    • Lee Waters, Deputy Minister for Climate Change, Wales
    • Scarlett McNally, Consultant Orthopaedic Surgeon, Eastbourne DGH[1]
    • Richard Thorold, Trustee, Louis Thorold Foundation
    • Rod King MBE, Founder and Campaign Director, 20’s Plenty for Us

    After short presentations there will be a panel discussion answering questions from attendees.

    Whether you are a campaigner, politician, transport engineer, road safety professional, public health professional or NGO you will find this webinar a ground-breaking one by discussing the UNGRSW call at a national level. It also shows the way forward to using 30km/h and 20mph limits as the foundation for the future liveability of our urban and village spaces, and for the UN's 2nd Decade of Action on Road Safety - 2021 to 2030.

    The webinar is free and you can register here.

    [1] Scarlett is also lead author for ‘Exercise the miracle cure’ and represents the Royal College of Surgeons of England on the UK Health Alliance on Climate Change

  • published Love30 Webinar 2021-05-07 14:38:41 +0100

  • Email your MP to support UN Global Road Safety Week

    The UN are calling for 20mph or 30km/h speed limits to become the norm in places where people on foot or on bicycle mix with motor vehicles. It is the key focus of the 6th UN Global Road Safety Week running from 17th-23rd May.

    This is backed by science and the call from communities to set speed limits that are compatible with liveable communities.

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  • It is smart for national governments to set national urban/village default speed limits of 20mph or 30km/h.

    Local governments in towns, cities and villages around the world are rejecting nationally set 30mph or 50km/h speed limits as no longer “fit for purpose” in meeting the needs of citizens and society. 20mph or 30km/h is now seen as the maximum safe speed limit where motor vehicles mix with pedestrians and cyclists unless there are adequate segregated and crossing provisions. 

    National governments should set 20mph or 30km/h as their national default urban/village speed limit.

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  • published The 25mph Conundrum in Blogs 2021-03-10 19:38:42 +0000

    The 25mph Conundrum

    Many people ask what to do if the average speed on a road is 25mph or above. Can you set a 20mph limit? Lets consider what I call "The 25mph Conundrum".

    Setting speed limits based on what drivers think is the right speed is a flawed approach. This is considered in a recent report from NACTO (National Association of City Transportation Officials). It concludes that "Relying on a percentile-based system focused on current driver behavior, rather than a defined safety target to set speed limits, significantly limits cities’ ability to reduce traffic deaths.


    So lets go through the logic of solving this conundrum for UK situations.


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  • published Why not "self-explaining" roads? in Blogs 2021-02-05 07:19:06 +0000

    Why not "self-explaining" roads?

    I have been having a discussion on LinkedIn with some engineers on the choice of building "self-explaining" roads rather than wide-area speed limits after posting this infographic.  My response was rather too long for the usual character limit on LinkedIn, hence it initiated this blog.


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  • published Pictures in Campaign 2021-01-17 11:21:02 +0000


    Here we have some pictures used by campaigners. You can right click on any of the images to download them.

    Use this photo for your Valentine day Tweets, Facebook and social media posts


    Campaigners in Chester making and using 20mph signs to remind drivers to keep to the speed limit


    An Irish child calls for 30km/h limits in UN Global Road Safety Week 2017


    Aldersgate Street, London


    Our banner being used outside a school in Buntingford


    Blackfriars Bridge, London - a main arterial road into the city.


    A driver shows support for a 30km/h limit


    A council banner used to support engagement with drivers in London Borough of Camden


    The squeezed cyclist


    Enforcement in 20mph areas.


    Creative campaigners during Halloween


    Children gain most from 20mph limits making their roads better places to be


    Campaigners for a 30km/h limit in Argentina


    Community event in the Isle of Wight


    Another lamp post banner in Lambeth


    See the world through the "eyes of a child" and 30mph becomes scary.


    Another arterial road with a 20mph limit.


    20's Plenty for cyclists


    Do you like Quality Streets?


    A 30mph urban limit is no longer "fit for purpose" in our towns and villages.


    A bike isn't just for Christmas - its the key to children's independent mobility


    20's Plenty across the world - This picture from Seattle


    Each year thousands of residents use their waste bins to say that 20's Plenty 


    London Mayor, Sadiq Khan made 20's Plenty one of his pledges before election.


    Life is simply better at 20. 


  • published What is intelligent speed assistance? in Blogs 2021-01-12 14:52:43 +0000

    What is intelligent speed assistance?

    Intelligent Speed Assistance - What it is and how it will affect compliance on speed limits

    A briefing by Rod King for the Welsh Government 20mph Task and Finish Group - 30th December 2019


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  • published Graphics in Campaign 2021-01-10 18:41:19 +0000


    Here we show some graphics that may be used. You can right click on any of the images to download them.

    Note that we have a page set up specifically for graphics associated with Wales. These are in Welsh and English language.

    Our logo

    White background

    Transparent 20s Plenty logo

    Transparent background

    Our latest range of graphics are here

    Welsh Diolch am 20/Thanks for 20 as .jpg

    Welsh Diolch am 20/Thanks for 20 as a .png



    Christmas Graphics: Twitter and Facebook

    Christmas Graphics: LinkedIn

    How does your Local Authority rate for 20mph (Twitter)

    How does your Local Authority rate for 20mph (Facebook)

    For Parishes

    White background

    Transparent background

    Our 2022 Valentine's Day graphics with optimal format for Facebook, Twitter and LinkedIn are shown below:


    Facebook Twitter LinkedIn

    You can download our Valentine's Day card here to send to...whoever you love...

    Our Infographic on setting a national 20mph limit for England



    Our graphic on 20mph and emissions


    Being hit at 20mph is like falling into a 3.6m trench (or from a 1st floor window). At 30mph it's like falling into a 8.8m trench (or from a 3rd floor window)

    Being hit at 20mph is like falling from a 1st floor window or into a 2.6m trench


    We have re-created the paper plates first used in Hertfordshire for children to say whey they want a 20mph limit. Here are some examples.


    The template for the plate is here.


    Also available as a Word Doc or a PDF file

    A 20's Plenty colouring page for children - Created by Sue Nicholls in our 20's Plenty for Hertfordshire campaign


    Also available as a Word Doc or a PDF file

     How 20mph/30kmh limits with public engagement beat physical calming in cost effectiveness


    Impact speeds (MPH) and the equivalent fall from height.


    The field of vision to observe pedestrians at 20mph and 30mph


    How vehicle noise decreases between 30mph and 20mph. A 3db decrease is equivalent to halving the noise.


    British Social Attitude Surveys over the years have shown a consistent 70% in favour of 20mph for residential roads.


    Risk of death for children


    Speed: The facts. Taken from a WHO publication.


    How speed Kills Infographic


    20 Saves a Plenty graphic from Bristol Cycling


    Its physics! People ask about how 20mph limits reduces emissions. This graphic shows the difference in energy (from fuel) required to reach 20mph or 30mph.


  • National and local governments are setting 20mph limits; why you should do the same

    A nearly universal aspiration in communities is to make traffic speed compatible with community life and human survivability.  A 30mph limit is no longer fit for purpose for urban and village streets. Lower default limits are being set. Choose 20mph.

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  • published 20mph is Value for Money in Briefings 2020-12-20 16:30:49 +0000

    20mph is low cost and brings wide benefits

    Among urban and village improvement options, 20mph ranks top for cost effectiveness. Over a wide area, 20mph benefits all road users and the whole community. Casualties fall 20%[1], noise almost halves and active travel rises. Councils can afford it.


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  • Our response to Scotland's Road Safety Framework to 2030 Consultation

    The Scottish Government has published its Road Safety Framework to 2030 Draft for consultation.

    We applaud the vision within this that "Our vision is for Scotland to have the best road safety performance in the world by 2030." 

    Scotland's road fatalities per million population stands at 30 this is considerably greater than leaders such as Iceland at 17 and Sweden at 22. Whilst such a radical vision is laudable we are concerned that the plans are not radical enough to catch up and overtake other countries in terms of road safety.

    Our response to the consultation points out that much more must be done if Scotland's performance is to match its' aspirations. It makes particular reference to speed management. 

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  • 20mph Campaigner Amanda Russell from Faversham wins National Award from Brake in Road Safety Week

    Star community campaigner Amanda Russell has won a National Award from the charity Brake for 20mph volunteering. She began 20’s Plenty for Faversham and the town now has the first 20mph town-wide scheme in Kent. Bravo!

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  • Article for Road Safety Markings Association Magazine

    We were asked to write an article for the annual Road Safety Markings Association's annual magazine.

    20’s Plenty – for the 2020’s

    A few year’s ago I had the pleasure of speaking at the RSMA annual conference and noticed the strong commitment to making our streets safer. In that I explained how the movement for slower speed limits on community streets was evolving.

    The 20’s Plenty (or Love 30 as it is known in km/h countries) was making great progress this year even before the Covid-19 pandemic and the realisation that we all needed more space and safety to move around our cities, towns and villages.

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  • commented on Resources 2021-06-27 10:34:24 +0100
    We now have banners available that say :-
    “Help our children walk and cycle to school”
    “Please give us 20mph (heart) speed limits”.

  • Darker Nights: 20mph Widens Fields of Vision and Halves Stopping Distances to Effectively Mitigate Risk At Source

    Clocks go back Sunday 25 October meaning darker nights. Sunset will be from 4.45pm and nightfall from 6pm.  20mph limits widen drivers’ fields of vision. This helps see hazards and take avoiding action earlier. Drivers can stop in half the distance compared to 30mph. 20mph reduces the kinetic energy with fewer deaths or life changing injuries.

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  • published School Banners - keep in Resources 2020-09-28 09:35:09 +0100

    School Banners - keep

    School banners measure 2m * 0.6m and come with eyelets. They are made from 210gsm polyester fabric which can be washed and recycled.  They can be used anywhere. but designed specifically for use outside your school, highlighting how driver can enable children to be able to walk or cycle to school safely.

    Banners cost £45 each plus £10 p&p. To purchase 1, 2 or 3 banners, click on the £55, £90 or £135 buttons and allow 5 working days for us to send them to you. If you want more than 3 banners, or you need delivery outside the UK please contact us.