From the BBC, an interactive graphic depicting just how deadly our favorite mode of daily tranportation is. In a dozen years it appears there isn't a single kilometer of roadway in the entire United Kingdom that didn't kill somebody. The same must be true in the United States. Doing a plot like this for the parts of Asia I've visited would probably not work: the entire region would be one solid block of light. BBC News - Every death on every road in Great Britain 1999-2010
They use the term "casualty" and in one place they use the word "injury." Is it clear that "casualty" means fatality? In normal use, it doesn't always mean that.
The BBC's own headline says every "death" so I assume here the term casualty is limited to fatalities, even though British usage of the word casualty normally includes injury also. Even if the chart depicted injury only crashes along with the fatal ones, it's still revealing to see no kilometer escapes incident in a dozen years. Using a car can hurt you more than you think.
Is there any reference that says that (that it's EVERY kilometer has had a casualty/fatallity) ? You can't infer that from the map, which doesn't have the resolution for such a claim. If you look at rural areas, for example, you see many areas with just scattered dots. If anything, the map looks exactly like a night time photograph...makes sense as the higher the density of people, the more accidents there will be. I would also assume that there are greater odds and a higher incidents of accidents at intersections of roads.
