183
submitted 1 year ago by DrCake@lemmy.world to c/fuckcars@lemmy.world

The Conservatives in Wales lose their last ditch attempt to stop the speed limit change from 30mph to 20mph. The change will be coming into force on the 17th September

you are viewing a single comment's thread
view the rest of the comments
[-] olafurp@lemmy.world 0 points 1 year ago

That whole study is specifically aimed at 20mph. It does reduce speed but not exactly by 10mph. It’s going to reduce traffic time, casualities, pollution and increase walking and public transport use.

There is a lot to like and for the places that it doesn’t apply people can always put up a sign for 30. Ideally this is supported by traffic calming measures but that’s a longer more costly.

[-] TWeaK@lemm.ee 2 points 1 year ago

If they put up a ton of 30 signs then it probably would be alright. Eg, the main road through a village or town could stay 30, while the main high street and side roads would all be default 20. But that requires more than just a change in law to say "what was 30 is now 20", and they don't seem to be doing this. They're expecting financially strapped local councils to go through a process of assessing and assigning 30 limits themselves, at their own expense. It likely won't happen in most places, they simply can't afford it.

[-] TWeaK@lemm.ee 2 points 1 year ago

Also, if you want to refer to that blog post as a "study", we should look only at its sourced claims.

  1. Motor traffic volumes decrease since slower speeds encourage active, sustainable and shared travel. Walking and cycling levels rose by up to 12% after Bristol’s 20mph limit [^1]

This is specifically about Bristol, a city with narrow roads.

  1. Smoother driving with less wasteful braking and acceleration cut fuel use by 12% in Germany after 30kmph (18.6 mph) limits were implemented [^2]

I'm sure Germany have implemented speed limits efficiently, but the UK has a history of compelling local councils to implement traffic measures that increase fuel consumption and thereby increase fuel tax revenue. Regardless, Germany have not changed all of their 50 kph zones to 30 kph, like this law proposes.

  1. The Department for Transport’s speed / flow plots are in the COBA (Cost Benefit Analysis) manual - Vol 13 of the Design Manual for Roads and Bridges. This computer programme shows that urban traffic flow improves at lower speeds [^3]

Urban traffic flow. This law covers everywhere.

  1. The FREEFLOW project by the University of York, City of York Council and others... Slough experimented with this successfully in the 1950s on a single arterial road. [^4]

This experiment was from 1950.

  1. Shared Space also enjoys claims of shorter tailbacks and congestion. The concept relies on cutting traffic speeds to around 20mph or less for ‘eye contact’. Traffic experts Ben Hamilton Baillie and Phil Jones state "tailbacks of traffic during peak periods have also reduced. It seems that the ambiguous junction provides improved capacity for traffic and fewer delays than traffic signal control systems." [^5]

Urban design, referring to handling specific zones of congestion.

None of these points apply to changing the national speed limit for Wales from 30 to 20.

[^1]: Cycling City project and Active Bristol / Monitoring by Bristol City Council http://www.betterbybike.info/sites/default/files/attachments/Cycling%20City%20end%20of%20project%20report.pdf [^2]: An illustrated guide to traffic calming. by Dr Carmen Hass-Klau (1990) [^3]: Link to a copy of the COBA 2002 manual – Traffic Flow plots are in Chapter 9: http://www.leics.gov.uk/part_5.pdf [^4]: http://www.freeflowuk.net/index.php?option=com_content&view=article&id=73&Itemid=59 [^5]: Improving traffic behaviour and safety through urban design. Proceedings of Institute of Civil Engineering. Ben Hamilton Baillie, Phil Jones May 2005 http://www.icevirtuallibrary.com/content/article/10.1680/cien.2005.158.5.39

Also check out this fancy markdown citation function!

this post was submitted on 16 Sep 2023
183 points (93.8% liked)

Fuck Cars

9806 readers
7 users here now

A place to discuss problems of car centric infrastructure or how it hurts us all. Let's explore the bad world of Cars!

Rules

1. Be CivilYou may not agree on ideas, but please do not be needlessly rude or insulting to other people in this community.

2. No hate speechDon't discriminate or disparage people on the basis of sex, gender, race, ethnicity, nationality, religion, or sexuality.

3. Don't harass peopleDon't follow people you disagree with into multiple threads or into PMs to insult, disparage, or otherwise attack them. And certainly don't doxx any non-public figures.

4. Stay on topicThis community is about cars, their externalities in society, car-dependency, and solutions to these.

5. No repostsDo not repost content that has already been posted in this community.

Moderator discretion will be used to judge reports with regard to the above rules.

Posting Guidelines

In the absence of a flair system on lemmy yet, let’s try to make it easier to scan through posts by type in here by using tags:

Recommended communities:

founded 2 years ago
MODERATORS