What is a traffic control measure often used to assist with safer left turns?

Traffic lights are often used as a traffic control measure to enhance safety during left turns. They regulate the flow of traffic at intersections, providing clear signals to drivers on when to proceed or yield. When a traffic light turns green, it indicates that it is safe for vehicles to make a left turn, provided they check for oncoming traffic and pedestrians. This organized approach helps prevent collisions by ensuring that turning vehicles have the right of way in a controlled manner.

In urban settings, traffic lights are especially valuable because they can manage heavier traffic volumes at intersections where left turns may prove challenging without proper signals. This system of regulation allows for safe gaps in traffic, reducing the likelihood of crashes that could occur when drivers make left turns without guidance.

Roundabouts, while beneficial for improving traffic flow and reducing conflict points, serve a different purpose compared to traffic lights. They facilitate continuous movement and can be more effective than traditional intersections in managing speeds and conflicts but may not always explicitly assist left turns in the way traffic lights do. Hence, traffic lights are the most effective measure mentioned for specifically aiding left turns at intersections.