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I came across this section on runway holding position marking while reading Jeppesen Airway Manual, which got me very confused.

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My question is: Is Pattern B describing another type of runway holding position sign other than the one described in Pattern A? Or is it just describing the ILS critical area boundary marking for CAT II & III approaches? I'm asking this question because I've never heard in my whole aviation career that there are "two" runway holding position markings, nor seen one.

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The Jeppesen description is confusing (to me) but have a look at the AIM 2-3-5 and specifically Figure 2-3-16:

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It looks like the pattern A image you posted shows runway holding position markings only; pattern B shows runway holding position markings and ILS holding position markings.

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I’ve never seen the critical area hold bars referred to as a type of runway hold bars, but they serve the same general purpose when the critical area needs to be protected, so I can understand the point of describing them together.

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The "pattern B" markings designate the boundary of the ILS critical area, from which aircraft (and other things) are excluded during ILS operations. An aircraft exiting the runway knows it is safely outside the ILS critical area by passing that boundary marking.

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