**Maps Show the Impact of 20mph Speed Limit on Journey Times in Wales**
Analysis of the effects of the 20mph speed limit in Wales over the first six months since its implementation has shown that journey times have become slower on various roads. While the average journey times have increased in most cases (55 out of 60 points where data was analysed), the increments have generally been minimal, with almost all points seeing an increase of less than 2 minutes, and over half experiencing an increase of less than a minute.
The research also revealed that vehicle speeds on 20mph main through roads have decreased by an average of 4.3mph. The 20mph default speed limit was introduced on September 17, 2023, with the aim of reducing road collisions’ likelihood and severity, promoting walking, cycling, or scooter use, and supporting mental and physical health. However, it is too early to assess casualty rates as meaningful comparisons would require three years’ worth of collision data post-implementation.
Moreover, changes in CO2 emissions and public attitudes towards 20mph speed limits, including perceptions of traffic speeds, noise, and community effects, will be evaluated in future research. The impact on active travel use in built-up areas has not seen a significant shift according to current findings.
Data on vehicle speeds before and after the implementation of the 20mph limit at various monitoring sites across Wales illustrated a reduction in vehicles travelling at or below 24mph post-law enactment. Locations such as Allt-yr-yn in Newport and Tylorstown showed significant increases in compliance with the lower speed limit.
Overall, the analysis provides insights into the initial effects of the 20mph speed limit in Wales, highlighting changes in journey times and vehicle speeds. As further data collection and research are conducted, a more comprehensive understanding of the long-term impacts of the speed limit can be expected.
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