S-574d
Ten-kilometer post on autopista or autovía on an international route
Indicates the kilometer point, when it is a multiple of ten, on an autopista or autovía belonging to an international route, whose identification appears at the top of the sign.
Category: Location signs
Source: General Traffic Regulations (RD 1428/2003), Annex I; designs per the official sign catalog (RD 465/2025)