S-991f
Minimum following distance enforcement on autopista or autovía
Indicates a device that monitors the minimum distance between vehicles at a point or along a section of an autopista or autovía. 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)