Flutterby™! : 20mph

20mph

2021-10-09 00:08:51.14143+02 by Dan Lyke 1 comments

New research on emissions strengthens case for a 20mph default urban speed limit

New research[1] from engineering consultants, Skyrad, models the impact of capping speeds at 20mph vs. 30mph. This “real life” modelling that takes account of the stop/start nature of urban traffic yields a very different result from traditional steady-state models. It shows significant and substantial reductions in emissions: CO₂ lower by 26% and NOx 28% lower. With UK hosting COP26, campaigners are calling on governments to set 20mph or 30km/h limits as national urban/village defaults.

[ related topics: Nature and environment Invention and Design Law Television ]

comments in ascending chronological order (reverse):

#Comment Re: 20mph made: 2021-10-12 02:54:45.846974+02 by: Mars Saxman

This is not "real life" modelling at all, because it assumes that speed limits are more than just a number printed on a sign, and that speeds can therefore be lowered by merely posting different signs. In *real* real life, driving speed is largely determined by road geometry...

Add your own comment:

(If anyone ever actually uses Webmention/indie-action to post here, please email me)

Format with:

(You should probably use "Text" mode: URLs will be mostly recognized and linked, _underscore quoted_ text is looked up in a glossary, _underscore quoted_ (http://xyz.pdq) becomes a link, without the link in the parenthesis it becomes a <cite> tag. All <cite>ed text will point to the Flutterby knowledge base. Two enters (ie: a blank line) gets you a new paragraph, special treatment for paragraphs that are manually indented or start with "#" (as in "#include" or "#!/usr/bin/perl"), "/* " or ">" (as in a quoted message) or look like lists, or within a paragraph you can use a number of HTML tags:

p, img, br, hr, a, sub, sup, tt, i, b, h1, h2, h3, h4, h5, h6, cite, em, strong, code, samp, kbd, pre, blockquote, address, ol, dl, ul, dt, dd, li, dir, menu, table, tr, td, th

Comment policy

We will not edit your comments. However, we may delete your comments, or cause them to be hidden behind another link, if we feel they detract from the conversation. Commercial plugs are fine, if they are relevant to the conversation, and if you don't try to pretend to be a consumer. Annoying endorsements will be deleted if you're lucky, if you're not a whole bunch of people smarter and more articulate than you will ridicule you, and we will leave such ridicule in place.

Flutterby™ is a trademark claimed by

Dan Lyke

for the web publications at www.flutterby.com and www.flutterby.net.