An area with dense vegetation (low visibility) which reduces running to about 60-80% of normal speed.
Where runnability is better in one direction, a regular pattern of white stripes is left in the screen to show the direction of better running.
Minimum area: 1 mm x 1 mm (footprint 15 m x 15 m).
Minimum width: 0.4 mm (footprint 6 m).
Colour: green 30%.