Which factor increases traffic congestion in urban areas?

The high volume of vehicles is a significant factor that contributes to traffic congestion in urban areas. As the number of vehicles on the road increases, the space available for each vehicle decreases, leading to slower movement and increased likelihood of bottlenecks. This situation is often exacerbated in cities where road networks may be limited, leading to over-crowded streets. More vehicles can also contribute to higher levels of emissions, noise, and other environmental issues, which further impact urban living conditions and mobility.

In contrast, carpooling and public transportation are strategies intended to reduce the number of individual vehicles on the road. Improvements in road conditions can enhance traffic flow and capacity, reducing congestion, while a reduction in the service economy might imply fewer vehicles are necessary to meet urban needs. All of these factors work in opposition to the scenario presented by a high volume of vehicles, which, by itself, leads to increased congestion.