What does split phasing refer to in traffic control?

What does split phasing refer to in traffic control?

• A. Simultaneous phases for all movements
• B. One phase for all movements on one approach
• C. Alternating signals for left turns only
• D. Maximizing green time across all approaches

Answer: (B)

Split phasing in traffic control refers to the operation of a traffic signal where one phase is dedicated to all movements on one approach at a time, allowing those vehicles to clear the intersection before providing a signal for movements from other directions. This method helps eliminate conflicts between left turns and oncoming traffic, improving safety and efficiency in certain scenarios. Choosing this approach is particularly beneficial in intersections where certain turning movements could otherwise cause delays or accidents. By isolating phases, the traffic signal can effectively manage the flow of vehicles, reducing the likelihood of crashes and potentially simplifying the operating conditions for drivers. The other choices do not accurately describe split phasing. Simultaneous phases for all movements could lead to conflicts at the intersection, while alternating signals for left turns only does not encompass the broader application of managing all approach movements. Maximizing green time across all approaches does not relate directly to the concept of split phasing; instead, it suggests an optimization strategy that may or may not involve split phases.

Split phasing in traffic control refers to the operation of a traffic signal where one phase is dedicated to all movements on one approach at a time, allowing those vehicles to clear the intersection before providing a signal for movements from other directions. This method helps eliminate conflicts between left turns and oncoming traffic, improving safety and efficiency in certain scenarios.

Choosing this approach is particularly beneficial in intersections where certain turning movements could otherwise cause delays or accidents. By isolating phases, the traffic signal can effectively manage the flow of vehicles, reducing the likelihood of crashes and potentially simplifying the operating conditions for drivers.

The other choices do not accurately describe split phasing. Simultaneous phases for all movements could lead to conflicts at the intersection, while alternating signals for left turns only does not encompass the broader application of managing all approach movements. Maximizing green time across all approaches does not relate directly to the concept of split phasing; instead, it suggests an optimization strategy that may or may not involve split phases.