Operation for a robotic work tool

A robotic work tool system comprising a robotic work tool arranged to operate in an operational area wherein the robotic work tool comprises an obstacle sensor and a controller configured to:

• receive sensor input from the obstacle sensor,
• detect an obstacle and determine a dimension of the obstacle,
• determine whether the dimension exceeds a threshold size large enough to obstruct a view of a human on an opposite side of the obstacle relative to the robotic work tool, and if so
• circumvent the obstacle while maintaining a safety distance to the obstacle such that the robotic work tool does not approach the obstacle at a distance shorter than the safety distance prior to a view of the opposite side of the obstacle being obtained by the robotic work tool,
• determine whether the human is behind the obstacle, and
• take evasive action in response to determining the human is behind the obstacle and operate in an area in which the view is obtained in response to determining the human is not behind the obstacle.