South Wales has the lowest rates for the most serious road casualties recorded per head of population in British Parliamentary Constituencies.
Four Cardiff constituencies, along with Torfaen and Newport West, rank in the bottom 10 of all constituencies for residents killed or seriously injured.
Constituencies where KSI rates are lower for residents are likely to be large towns and small cities.
Direct Line Car Insurance and an All-Party Parliamentary Group found residents of Great Grimsby parliamentary constituency in the East of England have the highest road casualty rate in Britain.
The constituency has a resident casualty rate, for those killed or injured on the roads, 52 per cent higher than the national average.
Constituencies in the North and East of England have the highest resident casualty rates in Britain, with both Lincolnshire and Lancashire having three constituencies each in the top ten. The constituencies of Preston, Peterborough and Boston & Skegness all have resident road casualty rates 40 per cent above the national average.
Wales worst area for KSI crashes was Montgomeryshire. Rural roads with high speed sections and darker roads are most likely to cause the worst accidents while built up places with lower speed limits and speed-humps have the best record reducing injuries.
Really serious injuries or death are most likely to happen in Scotland.
Banff and Buchan in the Aberdeenshire area of Scotland has a KSI rate 111 per cent higher than the national average for Britain.
The region also has the next two highest ranking constituencies, West Aberdeenshire and Kincardine (82 per cent above the national average) and Gordon (70 per cent above the national average), for KSI road casualties.
