The year slicer on the bottom is excellent, allowing you not only to quickly jump between years, but also to see how accidents vary over the months in each year. My only wish is that you could show the markers for all years, allowing you to better identify accident hotspots, and that they superimposed a line across years to show a trend of total accidents.
On another tab, they have the breakdown of accidents by time of day. The buttons on the side allow you to see the pie chart and time of day statistics by the category chosen. A pie chart is not my first choice here - a bar chart would be better, but you can click a section of the pie to show the time of day data by just that segment - mouseover the image below to see when young people kill themselves vs. the older population. I think the radial bar chart works very well in this case, especially with the radial gridlines.
In a previous career I was a consultant focusing on fatigue and safety, so these data are of particular interest to me - for example, if you select vehicles, then the pie segment for goods vehicles, you can see the spike in accidents at 4AM as truckers fall asleep at the wheel and crash. The only thing missing (which you rarely see in data like these) is normalization - the risk of driving in the early hours is so much greater than at other times of the day considering the amount of traffic. An excellent example of data visualization.
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