Computer · Traffic Engineering

A 3-phase traffic signal at a 4-legged intersection is designed with 6 traffic movement groups (A through F), where A, C, D, and F are straight/through flows, and B and E are right-turning flows. Consider the following phase combinations: Scheme W: Phase-I (A, B); Phase-II (D, E); Phase-III (C, F) Scheme X: Phase-I (A, D); Phase-II (C, F); Phase-III (E, B) Scheme Y: Phase-I (A, D); Phase-II (C, E); Phase-III (B, F) Scheme Z: Phase-I (A, B); Phase-II (E, F); Phase-III (C, D) Identify the phasing scheme that is NOT recommended due to critical traffic conflicts.