What type of lane is commonly used in cities to facilitate safe left turns in the middle of the block?

The correct answer is the shared left-turn lane. This type of lane is specifically designed to allow vehicles from both directions to safely make left turns in the middle of the block. Shared left-turn lanes help streamline traffic and reduce the potential for accidents by providing a designated space for drivers to wait while turning left, minimizing disruption to oncoming traffic.

In urban environments, these lanes often appear at mid-block locations to help vehicles transition without obstructing through traffic. They are marked with specific signs and road markings to ensure that drivers understand their purpose and to promote safer driving practices.

The other options, while related to turning maneuvers, do not serve the same function. A turning lane may refer to any lane that allows turns, but it is typically used at intersections rather than mid-block. A dedicated turn lane is usually a lane reserved for vehicles turning in one direction at an intersection, not shared between opposing traffic. An exit lane pertains to highway or freeway scenarios, leading off to another roadway, which is not relevant to the function described in the question.