Defining 3D traffic signals
In the Network editor, you can define network objects of the network object type 3D Traffic Signals in 2D mode and in 3D mode (Defining a 3D traffic signal in the Network editor).
Other signal heads may only be defined in 2D mode (Defining signal heads).
In 2D mode, you can add a 3D signal head to a signal head in the Network editor (Adding a new 3D traffic signal for signal head).