I worked once at a station with a similar setup. Grass cutter would cruise along the edge of the runway, facing the landing traffic. As they turned onto final approach, he'd mosey off and return once they'd passed. No radio comms, nothing!! I used to get the fire dept out and tell him to stop, regardless of fights with my line manager about it. At the end of the day, someone crashes into him when he;s within 50m and who's going to take the fall. The law is clear, and if you'll be standing alone if something happens...
My 2c
