R-406
Roadway for trucks, vans and light commercial vehicles
Drivers of all trucks and vans, regardless of mass, must use the roadway at whose entrance the sign is placed. A tonnage figure on the vehicle silhouette or on a supplementary plate means the requirement applies only when the maximum authorized mass of the vehicle or combination exceeds that figure.
Category: Mandatory signs
Source: General Traffic Regulations (RD 1428/2003), Annex I; designs per the official sign catalog (RD 465/2025)