The pie charts compare the main causes of traffic congestion in two urban areas, namely City A and City B.
Overall, while both cities experience congestion due to several similar factors, the most significant causes differ. In City A, private car usage accounts for the largest proportion of traffic problems, whereas in City B public transport limitations appear to be the primary contributor.
In City A, private vehicles make up the biggest share of congestion, at approximately 45%. This is followed by roadworks, which represent around 25%. Accidents account for roughly 15%, while inadequate public transport and population growth contribute smaller proportions, at about 10% and 5% respectively.
By contrast, in City B, insufficient public transportation is the leading cause, responsible for nearly 40% of congestion. Private cars contribute a smaller but still substantial percentage, at around 30%. Road construction and accidents account for similar shares, approximately 15% and 10%, while population growth remains the least significant factor, at about 5%.
In summary, although both cities face traffic issues from multiple sources, City A is more affected by private car dependency, whereas City B struggles mainly with weaknesses in its public transport system.