Final answer:
The lowest RVR permitted for takeoff depends on various factors such as the type of aircraft, its equipment, and the operating rules of the specific airport or aviation authority. In general, most airports require a minimum RVR of 550 meters (1,800 feet) for a commercial aircraft to take off safely.
Step-by-step explanation:
The lowest RVR (Runway Visual Range) permitted for takeoff depends on various factors such as the type of aircraft, its equipment, and the operating rules of the specific airport or aviation authority. In general, most airports require a minimum RVR of 550 meters (1,800 feet) for a commercial aircraft to take off safely. However, this value can vary based on specific conditions and airport regulations.