How can I code “split phasing” for actuated controllers?
Suppose that split phasing is desired for the side-street approaches to an intersection where the side streets are oriented in an east-west direction. For split phasing, all eastbound movements are served by a single phase, followed by a single phase for all westbound movements. Typically, side-street phases are coded in dual-ring phases 3, 4, 7, and 8. Phases 3 and 7 are designed to run concurrently because they are typically used for overlapping protected left turns. Similarly, phases 4 and 8 are designed to run concurrently to support concurrent side-street phasing (both directions concurrently, with permitted left turns possible). Because only one phase in each ring can be active, coding all eastbound movements in phase 3 and all westbound movements in phase 4 will implement split phasing. Alternatively, phases 7 and 8 could be used. Because CORSIM does not allow the specification of a barrier between phase 3 and 8 (or 4 and 7), they can also operate concurrently and cannot be used
