Calendar An icon of a desk calendar. Cancel An icon of a circle with a diagonal line across. Caret An icon of a block arrow pointing to the right. Email An icon of a paper envelope. Facebook An icon of the Facebook "f" mark. Google An icon of the Google "G" mark. Linked In An icon of the Linked In "in" mark. Logout An icon representing logout. Profile An icon that resembles human head and shoulders. Telephone An icon of a traditional telephone receiver. Tick An icon of a tick mark. Is Public An icon of a human eye and eyelashes. Is Not Public An icon of a human eye and eyelashes with a diagonal line through it. Pause Icon A two-lined pause icon for stopping interactions. Quote Mark A opening quote mark. Quote Mark A closing quote mark. Arrow An icon of an arrow. Folder An icon of a paper folder. Breaking An icon of an exclamation mark on a circular background. Camera An icon of a digital camera. Caret An icon of a caret arrow. Clock An icon of a clock face. Close An icon of the an X shape. Close Icon An icon used to represent where to interact to collapse or dismiss a component Comment An icon of a speech bubble. Comments An icon of a speech bubble, denoting user comments. Ellipsis An icon of 3 horizontal dots. Envelope An icon of a paper envelope. Facebook An icon of a facebook f logo. Camera An icon of a digital camera. Home An icon of a house. Instagram An icon of the Instagram logo. LinkedIn An icon of the LinkedIn logo. Magnifying Glass An icon of a magnifying glass. Search Icon A magnifying glass icon that is used to represent the function of searching. Menu An icon of 3 horizontal lines. Hamburger Menu Icon An icon used to represent a collapsed menu. Next An icon of an arrow pointing to the right. Notice An explanation mark centred inside a circle. Previous An icon of an arrow pointing to the left. Rating An icon of a star. Tag An icon of a tag. Twitter An icon of the Twitter logo. Video Camera An icon of a video camera shape. Speech Bubble Icon A icon displaying a speech bubble WhatsApp An icon of the WhatsApp logo. Information An icon of an information logo. Plus A mathematical 'plus' symbol. Duration An icon indicating Time. Success Tick An icon of a green tick. Success Tick Timeout An icon of a greyed out success tick. Loading Spinner An icon of a loading spinner.

20mph speed limits have little impact on road safety – study

Roads with a 20mph limit did experience a reduction in traffic, according to the report (Dominic Lipinski/PA)
Roads with a 20mph limit did experience a reduction in traffic, according to the report (Dominic Lipinski/PA)

Cutting speed limits on urban roads to 20mph does not significantly improve safety, a new report suggests.

Researchers analysed data from before and after the limit was introduced on 76 roads in central Belfast in 2016.

The study found “little impact on long-term outcomes” in the city.

Comparisons with streets in the surrounding area and elsewhere in Northern Ireland that retained their 30pmh or 40pmh limit showed there were “no statistically significant differences” in terms of the number of crashes, casualty rates or average traffic speed.

Roads with a 20mph limit did experience a reduction in traffic, according to the report published online in the Journal of Epidemiology and Community Health.

A 20mph speed limit
Lower speed limits have been introduced across the UK in recent years (Dominic Lipinski/PA)

The authors of the report, who include Professor Ruth Hunter of Queen’s University Belfast and Dr Ruth Jepson of the University of Edinburgh, noted that their research was smaller in scale than some other studies on the topic.

The report said that 20mph limits could be combined with other measures such as driver training, CCTV and police communications to “facilitate an ambitious culture change that shifts populations away from the car-dominant paradigm”.

It added that reducing speed limits is “not simply a road-safety intervention” but can be “part of the fundamental reset of the way we choose our life priorities – people before cars”.

Schemes to cut speed limits to 20mph have become increasingly popular in the UK and other parts of Europe in recent years as part of effort to reduce crashes and injuries.

The Welsh Government has committed to lowering speed limits to 20mph on all roads in the country where cars mix with pedestrians and cyclists.

RAC road safety spokesman Simon Williams said: “The findings of this study are surprising as they appear to suggest that drivers on 20mph roads in Belfast hardly slowed down at all, despite the lower speed limit, which is at odds with other reports.

“It seems there is a serious problem with compliance as we would expect that even without enforcement, average speeds would drop.

“Consequently, the study may demonstrate a need for councils to find other ways to get drivers to slow down, whether that’s through enforcement or modifying road design with traffic islands, well-designed speed humps or chicanes.”

Mary Williams, chief executive of road safety charity Brake, described 20mph limits as “life-saving”, particularly for pedestrians and people riding bicycles and motorbikes.

She went on: “It is a matter of physics. At speeds of 20mph or less, drivers have significantly more chance to spot hazards and stop in time.

“The difference between a 20mph limit and a 30mph limit is a doubled stopping distance.”