Which of the following is an expected consequence of adding a left-turn lane at an intersection?

Adding a left-turn lane at an intersection is primarily aimed at improving traffic flow and increasing the overall capacity of the intersection. By providing a dedicated lane for vehicles turning left, the left-turning traffic can move out of the through lane, minimizing disruptions for vehicles traveling straight. This separation allows for smoother traffic movement and reduces conflicts between left-turning vehicles and through traffic, which can lead to a more efficient intersection operation and higher vehicle throughput.

Increased capacity is achieved because the dedicated left-turn lane helps reduce the likelihood of blockage of the through lanes, allowing for better management of traffic signals and more optimal use of green light intervals. This improvement can also encourage better compliance with traffic laws and reduce the potential for delays caused by left-turning vehicles stopping or waiting in the travel lane.

While there could be other effects related to safety or pedestrian considerations, the primary intended outcome of adding a left-turn lane is to enhance the capacity of the intersection, facilitating a smoother and more efficient flow of traffic overall.