Figure 14-21. (A) Enhanced taxiway centerline marking. (B) Enhanc ed taxiway centerline marking and runway holding position marking.  Enhanced taxiway centerline marking extends 150 feet prior  to a runway holding position marking.  Prepare to STOP . Figure 14-20.  Orientation of signs is from left to right in a clockwise  manner. Left turn signs are on the left and right turn on the right.  In this view, the pilot is on Taxiway Bravo.  A F S S B F A  S S B F F B Prepare to STOP  unless you have been cleared onto  or across the runway by ATC.  B  Enhanced taxiway centerline marking extends 150 feet prior to a runway holding position marking.  Prepare to STOP .  A  14-13 