Information from the Indiana Department of Transportation website:

The Indiana Department of Transportation will begin using flashing yellow arrow traffic signal indications for protected/permissive left turns as part of signal modernizations on the state highway system. A protected/permissive left-turn signal is a signal face that contains a protected phase where left turners have the exclusive right-of-way and a permissive phase where left turners may make their turn if there are no opposing through vehicles.

Over the next several years, INDOT will be installing new four-section signal heads – which include a flashing yellow arrow. These signals will replace the left-turn traffic signals that do not include a flashing yellow arrow. At certain locations with vertical clearance limitations, INDOT may use an alternative three-section signals to display flashing yellow arrow indications.

The new left-turn signal will improve intersection efficiency by allowing more left turns by enabling drivers to utilize cross-traffic gaps. The new signals also will improve intersection safety by providing an instruction to left-hand turning drivers that remains for the entire signal phase.

Read more: Flashing Yellow Arrows Coming to U.S. 35 and NewPorte Boulevard in LaPorte