If a pedestrian presses the button at a Puffin crossing but then walks away, what does the system recognize and do?

Answer

It recognizes this and does not unnecessarily hold up traffic

The sensors actively monitor the presence of waiting pedestrians; if a pedestrian presses the button but then leaves, the system recognizes this absence and avoids holding up traffic unnecessarily.

If a pedestrian presses the button at a Puffin crossing but then walks away, what does the system recognize and do?
inventioninventortrafficroadcrossing