A campaign to reduce road casualties across the UK has been far more successful in some areas than others, a new study suggests.
The size of fall in the amount of road users killed or seriously injured (KSIs) is far higher in London (36% between 2005-09 and 2010-13) than it is in Wales (15%).
The Parliamentary Advisory Committee for Transport Safety and RAC Foundation analysed figures by area over the eight-year span.
The study also showed that motorists on English roads are far less safe than those in Scottish and Northern Ireland. The report has prompted RAC Foundation officials to call on the authorities to learn from what is and isn't working across the UK.
Stephen Glaister, director of the RAC Foundation, said: "The UK risks breaking apart in terms of road safety policy with different administrations having varying levels of power, funding and political will to deal with death and injury on the highways."
Prof. Glaister continued: "Overall, many fewer people were killed and injured on the roads at the end of the last Westminster Parliament than at the beginning.
"But given the flattening out of casualty figures, a probable increase in casualties in 2014 and a predicted increase in road traffic, it is important that national, regional and local governments review these trends, and share best practice to learn what is, and what isn't, working around."
The study showed that typical KSI reduction between 2005-09 and 2010-13 was 35% in Northern Ireland; 33% in Scotland and 19% in England, excluding London.
The average reduction across the UK overall was 23%.
Earlier research from Transport Scotland showed the total amount of road casualties dropped to the lowest level in its history in 2012.
The latest report found that the sharpest drop had been witnessed in 2010, with the fall levelling off since then.
The road's most vulnerable users - such as motorcyclists, pedestrians and cyclists - now make up a larger percentage of all highway fatalities. The number rose to 49% over 2013, from 46% during 2005-09.
Copyright Press Association 2015