A traffic jam is a situation where vehicles are unable to move freely on a road, leading to congestion. This often occurs during peak travel times, such as rush hour, when many people are commuting to and from work. Factors contributing to traffic jams include accidents, road construction, and high volumes of vehicles. Traffic jams can cause delays and frustration for drivers and passengers. They can also lead to increased fuel consumption and air pollution. To alleviate traffic jams, cities may implement measures like improving public transportation, optimizing traffic signals, and encouraging carpooling among commuters.