For the second Decade of Action for Road Safety the United Nations has endorsed the setting of 30km/h maximum speed limits wherever pedestrians, cyclists or other vulnerable road users mix with motor vehicles.

Following the 3rd Global Ministerial Conference on Road Safety in February 2020, the General Assembly of the UN has endorsed the Stockholm Declaration as key to delivering its Sustainable Development Goals for 2030 in its 2nd UN Decade of Action for Road Safety. This has a new target to reduce road deaths and injuries by 50% by 2030. Within the Declaration the resolution on Speed Management was to:

Focus on speed management, including the strengthening of law enforcement to prevent speeding and mandate a maximum road travel speed of 30 km/h in areas where vulnerable road users and vehicles mix in a frequent and planned manner, except where strong evidence exists that higher speeds are safe, noting that efforts to reduce speed in general will have a beneficial impact on air quality and climate change as well as being vital to reduce road traffic deaths and injuries;

In moving a default speed limit of 30km/h into the global mainstream of practical initiatives for both road safety and air quality/climate change, the UN is promoting sustainable mobility.

The endorsement by the UN is timed to benefit from the European Parliament's adoption of mandatory speed limiters on cars which will have a dramatic positive effect on driver compliance.