MUT and RCUT

NCHRP Research Report 1087 (2024), Appendix B, Details of Planning-Level Methods for Innovative Intersections and Interchanges. HCM 6th Edition, Chapter 23, is the operational chapter for these forms. The RCUT method cites HCM Exhibit 23-13. Progression uses the simplified factors from NCHRP Report 825.

Both forms reroute movements onto a main junction and supplemental junctions, then apply the signal planning method at those junctions. Experienced travel time adds the extra distance to the control delay. The lane config page draws each node: intersection2, intersection48, and intersection6 on a median U-turn, and intersection2, intersection4, intersection6, and intersection8 on a restricted crossing U-turn.

cycleLengthConfig is the signal plan for those junctions. Each thru value is the major-street green in seconds. The minor-street green is cycleLength - thru - 10. Those greens are used when isSignalPlanProvided is true. When it is false, the method estimates the greens and still reads cycleLength. Lost time defaults to 5 seconds per phase. Where the method designs the splits itself, critical movements are targeted at a volume-to-capacity ratio of 0.85.

The caller sends every cycle and green key. The service does not fill omitted keys. Sample seconds are on the MUT and RCUT pages.