Traffic congestion occurs when there are too many vehicles on the road, leading to slower speeds and longer travel times. This situation often arises during peak hours when many people are commuting to work or school. Factors such as road construction, accidents, and poor weather can also contribute to congestion. When traffic is congested, it can cause frustration for drivers and increase the risk of accidents. Additionally, it can lead to higher fuel consumption and increased air pollution. Cities often implement measures like public transportation improvements and traffic signal adjustments to help alleviate congestion.