![]() Results: When the bulbs were placed at the operator's eye level, front visibility was good no masking was found in the "A" vision sector, but larger masking widths were found in the "B" and "C"?vision sectors. Artificial light was supplied in the darkened environment, and shadow or masking effects were measured manually around the 12-m circle. The 12-m visibility test circle was divided into six sectors of vision, and the test tractor was placed at the center of the circle. A wooden frame was used to determine the seat index point position. Two bulbs used to simulate the operator's eyes were mounted on a bar with a supporting frame. ![]() Methods: A visibility measurement system was designed and evaluated based on the ISO 5006 and ISO 5721-1 standards. Purpose: A system to measure the visibility of agricultural tractor operators was designed and evaluated according to ISO standards, and a blind area diagram around the tested tractor was created based on the manual method recommended by the National Institute for Occupational Safety and Health (NIOSH).
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