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Best practice options: 20mph speed limits: Recommendations

World Health Organisation

The 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 roadSafe speed
Roads with possible conflicts between cars and unprotected users30 km/h
Intersections with possible side-on conflicts between cars50 km/h
Roads with possible frontal conflicts between cars70 km/h
Roads with no likelihood of frontal or side-on conflicts between road users100 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: 17 Jun 2018