S-1a
Autovía
Indicates the start of an autovía (divided highway) and therefore the point from which special autovía traffic rules apply. The symbol may announce the proximity of an autovía or indicate an intersection branch leading to an autovía.
Category: General information signs
Source: General Traffic Regulations (RD 1428/2003), Annex I; designs per the official sign catalog (RD 465/2025)