Road safety charity Brake has produced a free 'toolkit' to help local authorities encourage drivers to go 20mph or below in towns and villages.
The GO 20 toolkit, supported by Allianz Insurance, also highlights the benefits of 20mph limits in making streets safer for people to walk, cycle and live healthy lifestyles.
Brake says many areas that have introduced 20mph limits have seen reductions in casualties, such as Portsmouth where they fell by 22% and Camden where crashes have been reduced by 54%.
It says an estimated 12.5m people now live in places that have implemented 20 limits or are committed to doing so.
Brake deputy chief executiv,e Julie Townsend, said: 'Brake’s GO 20 toolkit is a brilliant resource to help groups and organisations spread the message about the importance of drivers going 20 or below in communities.
'The GO 20 campaign is about defending everyone’s right to walk and cycle freely without being endangered, whether it’s to get to work, school, the shops, or just getting out and being active.'
Earlier in the year Brake released a survey showing overwhelming public support for 20mph limits. It found eight in 10 people thought 20mph should be the norm around schools and homes and in town and city centres.
Jon Dye, chief executive of Allianz Insurance, said: 'We are delighted to continue working with Brake to campaign for safer streets and communities.
'The new GO 20 toolkit will help concerned individuals, schools, emergency services and local authorities to promote the benefits of drivers going 20 around homes, schools and shops.'
Resources in the toolkit include posters, web banners, leaflets, factsheets and an infographic.
