Heavy traffic refers to a situation where a large number of vehicles are on the road, leading to slower movement and congestion. This can occur during peak hours, such as morning and evening commutes, or during special events. Factors contributing to heavy traffic include road construction, accidents, and high population density in urban areas. When heavy traffic occurs, it can result in longer travel times and increased frustration for drivers. It may also lead to higher levels of air pollution due to idling vehicles. Traffic management systems and public transportation options, such as buses and trains, are often implemented to alleviate congestion.