What is the NEMA phasing for left turning phases at an eight phase intersection?

In an eight-phase intersection, the NEMA (National Electrical Manufacturers Association) phasing for left turning phases typically follows a specific pattern to optimize traffic flow and enhance safety for vehicles making left turns. The correct choice identifies phases 1, 3, 5, and 7 as the designated phases for left-turning vehicles.

Phases 1 and 5 generally represent the left turns from the major roads, whereas phases 3 and 7 might correspond to left turns from secondary or cross streets, depending on the configuration of the intersection. This alternating pattern of odd-numbered phases allows for efficient management of traffic, providing dedicated left turn signaling while minimizing conflicts with opposing traffic.

The choice reflects a common practice in traffic signal management where left turns are strategically planned to balance the movement of traffic across multiple directions at the intersection. This contrasts with other options that do not conform to the standard left turn phasing for an eight-phase system, which could lead to inefficiencies or increased risk of collisions.