<P> Double yellow lines along the edge of the carriageway indicate that waiting restrictions apply to the road (which includes the carriageway, footway and verge). A driver may stop for passengers to board or alight and to load or unload (unless there are also' loading restrictions' - see below). The regulation applies to all vehicles . The restriction applies from the centre of the carriageway to the back of the footway . </P> <P> Loading and unloading is allowed on double yellow lines at any time, unless there are additional markings indicating that there are' loading restrictions' . Two short yellow stripes at regular intervals across the kerb or edge of the carriageway indicate that loading and unloading is not permitted at any time (these are not accompanied by sign plates). A single short yellow stripe at regular intervals across the kerb or edge of the carriageway indicates that loading and unloading is not permitted at the times shown on accompanying black and white sign plates . Loading / unloading time is restricted to either 20 or 40 minutes depending upon the location (borough) if loading is observed . One must not cause an obstruction to traffic or pedestrians . </P> <P> Double yellow lines mean no waiting at any time, unless there are signs that specifically indicate seasonal restrictions . They were first introduced in the UK by section 51 of the Road Traffic Act 1960 (repealed in 1972 and replaced by later legislation). </P> <P> Countries that were once part of the British Empire are likely to retain a modified version of the British laws including the basic principles regarding road safety . </P>

When were yellow lines introduced in the uk