A single yellow line is a road marking

Road surface marking

Road surface marking is any kind of device or material that is used on a road surface in order to convey official information. They can also be applied in other facilities used by vehicles to mark parking spaces or designate areas for other uses....

 that is present on the side of the carriageway in the United Kingdom

United Kingdom

The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

. It indicates that parking

Parking

Parking is the act of stopping a vehicle and leaving it unoccupied for more than a brief time. Parking on one or both sides of a road is commonly permitted, though often with restrictions...

 or waiting at that roadside is prohibited at certain times of day. The exact times vary by area and are indicated by signs at the roadside. Stopping to load and to pick up or set down passengers is generally allowed unless additional restrictions apply.

British influence

Countries that were once part of the British Empire

British Empire

The British Empire comprised the dominions, colonies, protectorates, mandates and other territories ruled or administered by the United Kingdom. It originated with the overseas colonies and trading posts established by England in the late 16th and early 17th centuries. At its height, it was the...

 are likely to retain a modified version of the British laws including the basic principles regarding road safety.