Final answer:
Increased traffic can lead to increased congestion within cities along a route, resulting in longer travel times, traffic jams, and challenges in moving around the city. This can negatively impact the local economy and quality of life for residents. The correct option is d) "Caused increased congestion"
Step-by-step explanation:
The increase in traffic along a route can have various effects on cities, depending on factors such as the capacity of the road system and the infrastructure in place.
In many cases, increased traffic can lead to increased congestion within the cities along the route. This can result in longer travel times, more traffic jams, and difficulty in moving around the city.
For example, if a major highway that passes through multiple cities experiences a significant increase in traffic volume, it can lead to bottlenecks and delays in those cities. This can have negative effects on the local economy, as it may discourage business growth and deter tourists. Additionally, increased traffic can contribute to air and noise pollution, affecting the overall quality of life for residents in the cities along the route.
Therefore, one way that the increase in traffic can impact cities along a route is by causing increased congestion. The correct option is d) "Caused increased congestion"