The Runway Visual Range (RVR) for Category I operations are between 550 metres (1800 feet) and 800 metres (2600 feet) for ICAO and FAA, depending on the conditions of the approach and equipment.
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The lowest routinely used takeoff visibility minimum is 600 feet RVR, which is about one-tenth of a mile. Pretty low. It's the lowest visibility typically used in simulator training for taxi and takeoff practice.
Reportable values are RVR6,000 feet or less. When it is determined from a reliable source that the indicated RVR value differs by more than 400 feet from the actual conditions within the area of the transmissometer, the RVR data is not acceptable and must not be reported.