Ten years of road accidents in Cardiff:
This is a screenshot from an interactive map on The Guardian, which covers the entire UK:
The numbers are horrific: 32,955 killed, nearly 3m injured between 2000 and 2010. This is 10 years of deaths and injuries on Britain’s roads. But how do you visualise that level of disaster? Transport data mapping experts ITO World have taken a little-known but forensically detailed police dataset called Stats19 – published by the Economic and Social Data Service – and produced this powerful map ahead of Sunday’s world day of remembrance for road traffic victims. You can zoom around the map using the controls on the left or search for your town. Each dot represents a life
via Road casualty UK: 10 years of deaths mapped and visualised – guardian.co.uk
Note: The final sentence ‘Each dot represents a life’ is disingenuous inaccurate at this scale*. Each dot represents an effect on a life, but only the big squares represent a fatality.
halfblog.net 
I think ‘disingenuous’ is a bit harsh! The map starts out zoomed out where all the nodes are dots. It just doesn’t apply to the zoom level you’ve chosen to show.
Should add also that in the zoomed out state, only the fatalities are shown. So in the initial state, the ‘each dot represents a life’ comment is accurate.
Indeed. It should still have been better written, since the description was for an interactive map, not a static picture. He says you can zoom and search, and then adds that each dot represents a life.
Agreed, but it’s not really disingenuous, that implies a degree of dishonesty. Unless you think there’s a conspiracy to exaggerate the number of road deaths :)
* Fixed to keep Mark quiet.