Pedestrian button
From TrafficNeXt Wiki
Pedestrian buttons are used to signal to the controller that a pedestrian is waiting to cross a given approach. They are often mounted to the same pole as a pedestrian signal.
Currently, the only supported type is the digilines button. It must be set to the channel "pedbutton", with message "main" if crossing approach A or C, or message "side" if crossing approach B or D.
