The 3 year rolling average is a series of averages calculated by taking the mean number of monthly casualties for the most recent 36 month period. For example, the rolling average for December 2013 is the mean number of casualties for the period January 2011 to December 2013 inclusive. The rolling average for January 2014 is the mean number of casualties for the period February 2011 to January 2014 inclusive.
The mean number of casualties is calculated by adding up all casualties within the 36 month period, and dividing by the number of months, in this case 36.
Population data is taken from the
Office for National Statistics.
Mid year population estimates have been applied to entire calendar years for the purposes of calculating casualty risk.
Data regarding personal injury crashes is recorded by Sussex Police in accordance with the DfT Stats 19 requirements. The data is subsequently used by Sussex Safer Roads Partnership for monitoring and planning. While every effort is made to ensure that this data is accurate, it is subject to change should further information become available.
Please also note that collisions where Sussex Police have not yet finished their investigations are not shown. While this can apply to the whole time period covered, it is particularly relevant to those collisions that occurred in the most recent month.
This data may not be fully validated and while every effort is made to ensure its accuracy any statistics provided may not match those published elsewhere.
Sussex Safer Roads Partnership does not hold crash data either where there are no recorded casualties or the incident has not been reported to Sussex Police.