In Massachusetts, under what circumstance is it legal to make a left turn on a red light?

Answer: C — From a one-way street to another one-way street

In Massachusetts, it is legal to make a left turn on a red light when turning from a one-way street to another one-way street. This rule is designed to facilitate the flow of traffic and enhance safety in urban areas, where one-way streets are common. To execute this maneuver legally, drivers must ensure that the turn can be made without interfering with oncoming traffic or pedestrians. The left turn should be completed only after coming to a complete stop and yielding to all other road users. This context clarifies that other scenarios, such as making a left turn from a two-way street or from a one-way street to a two-way street, do not permit such a maneuver due to the potential for conflicts with traffic and the need for more stringent control at intersections. Hence, the only situation that allows for a left turn on red in Massachusetts is the transition from one one-way street to another, given that all safety precautions are followed.