The pie charts illustrate information about 5 factors (private car use, poor public transport, roadworks, accidents and others) that cause traffic congestion in the cities of A and B. The units are measured in percentages.
Overall, although usage of private cars is the most prevalent reason for traffic jams in city A, poor public transport overtakes all other causes in city B. In addition, accidents and others show higher proportions in city B than in city A.
In city A, private car use is the most common reason for traffic congestion, accounting for 45% of the total, and that is substantially more than poor public transport, which causes a quarter of the congestions. However, roadworks and accidents constitute minorities, at 15% and 10%, respectively.
By contrast, poor public transport is the leading cause in city B, representing 35%, even though the private car use indicates 15% less than its level in city A (30%). Nevertheless, other reasons show 10%, double that in city A. Although roadworks are a less common reason for traffic jams in city B (10%) than city A (15%), accidents in city B account for 15% and share an identical figure with roadworks in city A.