Between 2012 and 2021, the registered number of road deaths in BRON was approximately 14% lower than the number determined by Statistics Netherlands in the Road Death Statistics, which is considered to be the actual number. In 2021, the BRON registration rate was 87%: 74 of the 582 road deaths (according to Statistics Netherlands) were missing in the BRON database. The reasons for these missing data are subject to further investigation by SWOV. BRON is known to particularly miss crashes not involving any other parties, or exclusively involving non-motorized traffic, or when a casualty dies at a later date, or when there is confusion about the type of crash (vehicle entering the water, crashes at railways, indisposition, suicide, intent).
Since 2012, Statistics Netherlands has not been allowed to report to the Ministry of Infrastructure and Water Management which fatalities in the provisional BRON file it has not included in the Road Death Statistics. Before 2012 this difference was reported. This means that since 2012 an undetermined number of road deaths in BRON are not in fact road deaths in the Road Death Statistics. The result is that for some groups the number of road deaths according to Statistics Netherlands may be lower than the number reported by The Ministry of Infrastructure and Water Management in BRON.