S-1c
2+1 road
Indicates the start of a 2+1 road, meaning a road with three lanes and traffic in both directions. The center lane is for passing and is reserved alternately for each direction of travel. This sign may also mark an interchange ramp leading to a 2+1 road.
Category: General information signs
Source: General Traffic Regulations (RD 1428/2003), Annex I; designs per the official sign catalog (RD 465/2025)