ICAO Annex 14 
5.4.7 Road-holding position sign

Characteristics 
5.4.7.3 A road-holding position sign shall consist of an inscription in white on a red background. 
5.4.7.4 The inscription on a road-holding position sign shall be in the national language, be in conformity with the local traffic regulations and include the following:

a) a requirement to stop; and 
b) where appropriate:

1) a requirement to obtain ATC clearance; and 
2) location designator.

According to ICAO Annex 14, this sign is used to control vehicular traffic on aerodrome service roads when approaching a runway or taxiway.

A road-holding position sign indicates that vehicles must stop at the road holding position and, where required, obtain ATC clearance before proceeding onto the manoeuvring area. The sign has the following characteristics:

• White inscription on a red background
• The wording is written in the national language
• The message requires the vehicle to stop, and in some cases contact ATC
• It is placed where a service road intersects or approaches a taxiway or runway

Its purpose is to prevent unauthorised vehicle entry onto the manoeuvring area, thereby protecting aircraft operations.

A quick way to distinguish these signs:

Runway-Holding Position Sign: For Aircraft positions → show runway numbers (e.g., 09-27).

Road-Holding Position Sign: For Vehicle positions → show text instructions in the local language telling vehicles to STOP and possibly contact ATC.

If the sign is located on a service road and is aimed at vehicles rather than aircraft, it is a Road-holding position sign.