Therefore some operators may restrict autoland operations to CAT III equipped runways only where the signal geometry is guaranteed. What is the difference between CATI and CAT III on such a runway? Basically, the area on ground is not protected as much as CATIII operations require and back up electricity system may not be available in no-break mode (for CAT III the backup generator must be up and running and on-line). Other operators leave this to commanders responsibility.
Some aerodromes (speaking CDG) even have procedure for practice autolands in cat I conditions when ATC would clear the ground area and increase separation in order not to block the singnal during landing (e.g. by departing aircraft temporarily shielding the LOC antenna).
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