Used to identify runway designations, holding positions, NO-ENTRY areas, and obstacle-free zones where pilots must receive further ATC clearance to proceed.
At uncontrolled aerodromes, pilots are required to hold at points marked by these signs until they have ascertained that there is no conflict.
Mandatory instruction signs have white letters, numbers, or symbols against a red background and are installed typically on both sides of a taxiway or runway.

Runway Designation Sign

A runway designation sign is installed at all taxiway/runway and runway/runway intersections at certified aerodromes. The sign, when installed at the runway end, shows the designator of the departure runway. Signs installed at locations other than the runway ends shall show the designator for both runways.

Category I, II, III Holding Position Signs

Installed to protect the ILS critical area during IFR precision operations. CAT I, CAT II, and CAT III holding position signs are installed to protect the ILS critical area during IFR precision operations. A sign is installed on each side of the taxiway in line with the CAT I/II/III hold position marking. The inscription will consist of the designator of the runway and the inscription CAT I, CAT II, CAT III, or a combination, as appropriate.

No Entry Sign

A NO-ENTRY sign will be located at the beginning and on both sides of the area to which entrance is prohibited.

APCH Sign

Located at a runway holding position that has been established for the protection of approach or departure paths. The airport configuration may be such that these holding positions are located on runways or taxiways.

References

AIM AGA 5.8.3 – Mandatory Instruction Signs

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