This is the 3rd step in defining a NEMA control using the VS NEMA Wizard.

Overlaps are needed to define the behavior of all phases for individual traffic beyond the standard NEMA phases 1 to 8:

• Pedestrians (phases 10, 12, 14 and 16),
• Right turns (phases 17 to 20).

The panel consists of two main areas:

• At the right side there is - pro memoriam - a complete layout of all IVT phases of the intersection.

• At the left side there is the checkbox array in which the overlaps are defined. 

Check Box Array

The first row shows the 8 standard NEMA phases, phases 1 to 4 correspond to the first ring, phases 5 to 8 to the second.

The first column shows all phases which have to be assigned as overlaps: first the pedestrian phases, then the right turn phases.

In each column there is a number of checkboxes. If they are checked, the phases will go with the standard NEMA phase given in the column heading.

All overlaps for a complete four-legged intersection