The publication entitled Facts on Motorcyclist Casualties published in June 2015 provided information on the proportion of cars and light goods vehicles allocated the contributory factor ‘failed to look properly’ in accidents involving a motorcyclist casualty where a police officer attended the scene of the accident. These proportions for each year from 2013 to 2017 are presented in the table below. Since police officers do not always record a contributory factor when they attend a scene, we have also included data showing the proportion for those accidents where a contributory factor was recorded. This is the more commonly presented approach for contributory factors. Proportion of vehicles involved in accidents with at least one motorcycle casualty and police officer attending where 'Failed to look properly' contributory factor allocated, Great Britain, 2013 to 2017 As a proportion of all vehicles in these accidents As a proportion of all vehicles in these accidents where at least one contributory factor allocated Year Vehicle 2013 Car 47.4% 49.0% Light goods vehicle 46.8% 47.5% 2014 Car 47.8% 49.2% Light goods vehicle 48.8% 49.6% 2015 Car 48.6% 50.3% Light goods vehicle 45.9% 47.3% 2016 Car 45.7% 47.0% Light goods vehicle 46.2% 47.3% 2017 Car 40.0% 40.9% Light goods vehicle 37.7% 38.4% Source: DfT STATS19 Using this approach, the proportion of cars and light goods vehicles allocated the contributory factor ‘failed to look properly’ for the years 2009 to 2013 in the 2015 report would have been 48.1% and 48.2% respectively. Contributory factors assigned by police officers do not assign blame for the accident to any specific road user, however they do provide some insight into why and how road accidents occur. They give an indication of which factors the attending officer thought contributed to the accident. Officers do not need to carry out a full investigation of the incident before allocating contributory factors; they usually use professional judgement about what they can see at the scene.