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.