The Department for Transport (DfT) compiles data on personal injury road accidents, resulting casualties, and the vehicles involved. Accidents are those which occur on the public highway and which become known to the police within 30 days.
Data are available by three main areas:
(i) Accidents - including the severity of the accident, the number of vehicles and casualties involved, time and location, road class and number, speed limit, weather and road conditions, and carriageway hazards;
(ii) Vehicles - including type, location and manoeuvre at time of accident, and details of the driver (age, sex and breath test results);
(iii) Casualties - age, sex, injury severity and whether a driver, passenger or pedestrian.
More Source information to be found here ...