S-991b
Speed enforcement on autopista or autovía
Indicates a speed enforcement device at a point or along a section of an autopista or autovía. It may include an R-301 sign with the relevant speed, and upper or lower sub-panels with additional information may be added.
Category: Other signs
Source: General Traffic Regulations (RD 1428/2003), Annex I; designs per the official sign catalog (RD 465/2025)