The Box is simply a zone that sends configured outputs from GRIDSMART to the controller inputs when there are objects present and/or moving through. The intent is to extend the greens and/or the all red, based on how you program your controller, when there are objects in or passing through the Box. 

The Box has two types of these Extension Outputs, Bikes and Vehicles, that behave just as you would expect. Bike outputs are activated when there are bicyclists passing through the Box, Vehicle outputs are activated when there are vehicles or bikes passing through the Box.