One significant issue that all of us are going to have to deal with is the fact that our national, and in many case local, KSI figures are now meaningless for 2016. With many authorities such as Highways England and Transport for London adopting KSI targets, what are the next steps? Well, using the ‘all casualties’ data is one option but ultimately a set of correction factors will need to be applied. The DfT will almost certainly have to do this for 2016 and 2017 (when the rest of the forces should switch to CRASH), but how can individual forces and highway authorities do this on their own data? We have some ideas of how this can be done and will be talking to fellow analysts, and the DfT stats team about how this can be expedited to bring confidence in KSI analysis.
It's not all doom-and-gloom though, remember, the change in injury classification systems means we are now starting to get better information – something that has been a worry for some time. Comparing STATS19 against hospital statistics has always shown under-reporting by the police
We have always used all casualty data in our reports and whilst we have split out KSIs, we feel that these often bias against rural authority areas as it’s the higher-speed single carriageways that feature a greater proportion of KSI casualties. Urban authorities which have a lower KSI-to-slight ratio will be able to use all casualty data to monitor performance and trends within individual road user groups with some confidence.