S-51
Bus lane
Prohibits drivers of vehicles that are not public transport from using the indicated lane. The word taxi also authorizes taxis to use this lane. Where the outer longitudinal marking is broken, general use is allowed solely to perform maneuvers other than stopping, parking, U-turns, or passing, always yielding to buses and, where applicable, taxis.
Category: Lane signs
Source: General Traffic Regulations (RD 1428/2003), Annex I; designs per the official sign catalog (RD 465/2025)