This heatmap shows the frequency of accidents recorded in the months of March, April, and May in each weekday, and how the pattern is consistent in weekdays, but changes significantly in weekends.  Comparing the two graphs show that this pattern has followed the change of weekend days in Saudi Arabia, which happened in July 2013.  You can hover over every box to see the recorded number of accidents in each hour.

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Zingchart was used to create this visualization

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Data Source:

The General Department of Traffic’s Accidents records.