What is the separation for a Cat I aircraft landing behind a Cat III?

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On final approach, separation is about giving the trailing aircraft enough room to account for wake turbulence from the lead aircraft and to safely complete the landing. When the lead aircraft is landing under Cat III conditions, it typically represents a precision approach with the potential for stronger wake vortices and a longer need for spacing before the next aircraft can land. Because of that, the required gap for a Cat I aircraft following a Cat III is larger to ensure the vortices have dissipated and the trailing plane can land and roll out safely. The published minimum in this scenario is 6,000 feet, which translates to about 1.1 miles on final speaker path. The other distances are either too short to reliably account for wake turbulence or unnecessarily long; 6,000 feet strikes the right balance for safety and efficiency.