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Best practice options: 20mph speed limits: Recommendations
World Health OrganisationThe World Health Organisation has made the declaration on 20mph (30kph) speed limits [1]: A safe speed on roads with possible conflicts between cars and pedestrians, cyclists or other vulnerable road users is 30 km/h (see Table 2). To achieve these safe speeds, local authorities should have the legislative power to reduce limits as needed to better protect all who use the roads. In addition, drivers should be informed of limits through sign-posting the legal speed limit on roads and rigorously enforcing the law. The "Table 2" is as follows.
Safe speeds for a number of road types and their potential conflicts Type of road | Safe speed | Roads with possible conflicts between cars and unprotected users | 30 km/h | Intersections with possible side-on conflicts between cars | 50 km/h | Roads with possible frontal conflicts between cars | 70 km/h | Roads with no likelihood of frontal or side-on conflicts between road users | 100 km/h or more |
References[1] World Health Organisation (2017) Managing speed http://apps.who.int/iris/bitstream/10665/254760/1/WHO-NMH-NVI-17.7-eng.pdf
Last updated: 12 Jan 2020
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