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Also, if you want to refer to that blog post as a "study", we should look only at its sourced claims.
This is specifically about Bristol, a city with narrow roads.
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.
Urban traffic flow. This law covers everywhere.
This experiment was from 1950.
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!