The Gate object represents an individual ticket gate and can be set up to be an 'IN' Gate, an 'OUT' Gate or a 'Switch' Gate. An IN Gate enables pedestrians to travel from an unpaid to a paid area of a model; an OUT Gate enables pedestrians to travel from a paid to an unpaid area of a model; and a Switch Gate is one in which IN and OUT status can be alternated throughout a simulation. While there are several key parameters you can set for Gates, as with all objects, further control and logic is available through the use of Gate Control Profiles.

To clarify further:

• In gate – this gate enables pedestrians to flow through it from an unpaid area of the model to a paid area.
• Out gate – this gate enables pedestrians to flow through it from a paid area of the model to an unpaid area.
• Switch gate – the flow of pedestrians through this kind of gate can be alternated from In to Out throughout the simulation, according to its associated Gate Control Profile.

When drawing a Gate, there is no default setting for In, Out or Switch and you are able to choose which state you prefer after you've placed the object. The different states require slightly different parameters to be set, as described below. As with all objects, it helps to use the Model Builder's various Snap tools when drawing and placing a Gate.