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6.4.8. Taxiway Centre Line Lights.
These are GREEN lights at uniform interval delineating taxiway. The spacing is reduced to half along curved portions at turning points. Alternate GREEN and YELLOW lights are used to indicate taxi centre line within the ILS sensitive areas.
6.4.9. Stop Bars.
These may be provided at taxiway crossings and taxi-holding positions. A stop bar consists of rows of RED lights across taxiway. Stop bar is mandatory at taxi-holding position for a Cat-III runway.

6.4.10. Taxi-holding Position Lights.
These are two alternatively illuminated YELLOW lights –
one on either side of taxi-holding position.
They are mandatory for CAT-III runways.

6.5 Secondary power supply requirements.
Secondary power supply is provided to supplement main supply to ensure uninterrupted power to ILS system and visual aids. For Category II and IIIA/B operations, the maximum time for change over to secondary source are specified as 0 time for ILS Localizer and Glide path 1 second for ILS Inner and Middle Makers 10 seconds ILS Outer Markers 15 seconds for runway edge lights and for CAT-IIIA Ops all stop bars of taxiways. 1 second for all other runway and approach lighting and taxi-holding position lighting.
6.6. Facility Status and Reporting System.
For CAT-II and CAT-IIIA Ops., a stringent requirement of integrity of the ILS, visual aids and RVR measurements are specified. The performances of these aids need to be monitored during ILS approach and landings. Deterioration in any of their performance parameters must immediately be known to the ATC. Hence, a facility status monitoring and reporting system is mandatory for CAT-II and CAT-IIIA/B Ops.

Chapter -6  AIRFIELD REQUIREMENT FOR CAT II / III A/B  Page 56 

6.7  NOTAM.
The availability of a runway for CAT-II or CAT-IIIA Ops. must be ascertained by confirming from NOTAM the status of each element of ground installation that affects the precision approach category of the runway.
6.8  RVR MEASUREMENT AND REPORTING REQUIREMENT
6.8.1.  RVR Reporting & Accuracy.
RVR is reported from 50 m to 1500 m. Outside this range the  RVR is reported as “BLW 50 M” or “ABOVE 1500 M”. ICAO recommends that RVR reports are given in increments of not less than
-25 m steps for RVR below 150 m
-50 m steps for RVR form 150 m to 800 m
-100 m steps for RVR above 1200 m  Instantaneous report called Spot RVR can be obtained from ATC on request Accuracy of the observations, operationally desirable, is:
25 m. upto RVR 150 m. 
50 m. for RVR 150 m. to 500 m.
100 m. for RVR 500 m. to 1000 m.
200 m. for RVR above 1000 m.

6.8.2  RVR Measurement.
Three transmissometers are recommended for all CAT- II &  III runways and CAT-I runways of length 2400 m or more  Normally the transmissometers are located parallel to runway at 120 m distance from runway centre line and at about
　
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