Is it possible to model trailing green for overlaps?

I have two close intersections that operate as one. I need to keep no man's land clear of vehicles.

The way I've done this is to cluster the 2 intersections together using the "Cluster Editor". I then use one of the two rings (say Ring "A") for the phase controlling the farther end of the intersections, and model this with a longer green. For the inner approaches, I use the other ring (say Ring 'B'), with a shorter green, and longer all-red. This will force a "trailing green" and keep the area between the 2 intersections clear of vehicles.

- Jason

if there acutally is no signal head in the between the intersections (facing the interior) I'd coded this as all-green.