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5.4.6 TAXIWAY EDGE LIGHTS
Taxiway edge lights are not a specific CAT II or CAT III requirement, but provide efficient visual aid during low-visibility operations. The lights are fixed lights showing blue.
5.4.7 TAXIWAY CENTERLINE LIGHTS
Taxiway centerline lights have to be installed on airfields intended for use by operations with an RVR 400m or less (400m is the mean value for CAT II approach). The lateral spacing between lights must not exceed 15m but the proximity of a curve must be indicated by a spacing equal to, or less than, 7.5m. The lights are fixed lights showing green, but from the beginning of the taxiway to the perimeter of the ILS critical area/sensitive area or the lower edge of the inner transitional surface, the lights are alternately showing green and yellow.
5.4.8 STOP BARS
Stop bars are placed at each taxi-holding position when the runway is intended for use at an RVR less than 400m and are specially required for all CAT III approaches. The lights of the stop bars show red and are spaced at intervals of 3m. These stop bars are an efficient means to avoid aircraft intrusion into the obstacle-free zone (OFZ) or into the critical/sensitive area during approaches in very low visibility conditions.
Figure 5.4 Runways lights / Approach light system Figure 5.5 Taxiway lights

Taxiway centerline lights (green and yellow)
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5.5 VISUAL AIDS-APPROACH LIGHT SYSTEM
The approach light system is mandatory for CAT II operations, and only optional for CAT III operations. It consists of a row of lights on the extended centreline of the runway, extending over a distance of 300m from the threshold (over 900m for CAT I).
In addition, the system has two side rows of lights, extending 270m from the threshold, and two crossbars, one at 150m and one at 300m from the threshold as shown in Figure 5.5.
It is specified by the ECAC that sequenced strobe lighting is considered to be incompatible with CAT II and III operations. When installed for other operation, it should be switched off when CAT II or CAT III approaches are in progress.
5.5.1 EXTENDED CENTERLINE LIGHTS
The lights forming the centerline are placed at longitudinal intervals of 30m, with the first one located 30m from the threshold.
These lights consist of barrettes showing variable white. Each barrette is at least 4m in length. When a barrette is composed of point sources, the lights are uniformly spaced at intervals of no more than 1.5m.
5.5.2 SIDE ROW LIGHTS
The lights forming the side rows are placed on each side of the centerline, at alongitudinal spacing equal to that of the extended centerline lights (30m), with the first ones located 30m from the threshold. The lateral spacing (or gauge) between the lights is not less than 18m and no more than 22.5m, with a preference for 18m. In any case, the lateral spacing shall be equal to that of the touchdown zone lights (see 5.4.5).
These lights consist of barrettes showing red. The length of a side row barrette and the longitudinal spacing of its lights shall be equal to those of the touchdown lights barrettes.
　
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