Chart: Police crackdowns catch few drink drivers

Police routinely breathalyse drivers they suspect have been drinking, but also carry out an annual Christmas crackdown, breath-testing more than three times as many drivers in December as in other months. However, only about 1.6% of these extra tests catch a drink driver, compared to about 14% of routine tests.

larger image | annotated R code to produce this chart

Data source: Home Office, 2019


‘Extra’ tests associated with the annual Chirstmas crackdown on drink driving were calculated as the mean number of tests conducted in December each year minus the mean number of tests conducted in other months.

Matt Ashby
Matt Ashby
Lecturer in Crime Science

I am a lecturer in crime science at the Jill Dando Institute of Security and Crime Science at University College London (UCL). I am interested in crime analysis – particularly how crime concentrates in time and space – in crime prevention and in transport crime.