In the United Kingdom, what do double red lines at the roadside prohibit?

In the United Kingdom, double red lines at the roadside prohibit stopping at any time.

Red route markings are used mainly on important urban roads, especially in London, to keep traffic lanes clear. Double red lines mean that vehicles must not stop at any time, while single red lines impose restrictions during the times shown on nearby signs. The rule generally covers stopping to wait, park, or load, although certain exemptions can apply.

Red route controls are distinct from ordinary yellow-line restrictions. Yellow lines regulate waiting and parking under local traffic orders, whereas red routes are designed to maintain movement on strategic roads and are commonly enforced by cameras or patrols.

A driver may still need to check signs for additional rules, such as loading restrictions, bus lanes, or stopping controls at specific kerbs. The painted lines provide the primary visual warning, but supplementary signs explain exceptions and operating details.