Hi,

I am wondering is there a difference between selecting C-Min vs C-Max for those coordinated thru phases, in term of operation?

My unstanding is that when you set an intersection as actuated-coordinated control, the whole amount of the remaining time in a cycle will always be used by those coordinated phases before a conflicting phase being served. If this always is true, then selecting C-Min or C-Max is making no difference.

Let me know if you have any thought on this.

Thanks,

mtran

I found out by working in SimTraffic, that Cmin can produce some unique, undesirable results.

The Synchro / SimTraffic controller emulator does not have a feature for simultaneous gap out. This means that if phases 2 and 6 are coordinated, and 6 gaps out, SimTraffic can cause 6 to go red, without conditionally serving a corresponding phase (backing up to phase 5).

This means that in SimTraffic, if you operate the signal with C-Min, and you have a gap in direction of the approaching traffic, after the min time is served, the SimTraffic controller will likely go to red for the the movement that has gapped out, and keep the other movement that has not gapped out green until that approach either forces off or gaps out.

I found that it always works better to just assume that the coord phases will operate C-MAX unless you have a lagging left arrow.

I have asked Trafficware about this in the past, and they did not really have an answer that I found that solved this problem - other than run the coordinated operation in C-MAX. It makes me wonder how the software can emulate fully actuated - coordinated operation for a signal, if you can not adjust the yield point by phase, nor make specific movements simultaneously gap out.