Double yellow line
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A double yellow line is a common road marking meaning different things in many parts of the world.
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.
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 They were first introduced in the UK by section 51 of the Road Traffic Act 1960 (repealed in 1972 and replaced by later legislation).
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. You must not cause an obstruction to traffic or pedestrians. 
Double yellow lines on the side of the road have a similar meaning (no parking at any time) as the United Kingdom.
Hong Kong is one of the regions using double yellow lines on the side of carriageways outside the UK.
A double yellow line, compared to a double white line, indicates a no-passing restriction. Double white is just a no passing suggestion.
A double yellow line means no stopping. This means that unloading of goods and alighting of passengers is not permitted. 
Singapore, an ex-crown colony of the UK, also uses double yellow lines to indicate no parking at the sides.
Mauritius was once a British colony, and today still applies double yellow lines to mark restricted parking areas at all hours on the sides of carriageways.
In Canada, a double yellow line in the centre of the road means that it is unsafe for traffic travelling in either direction to pass. It is usually found on rolling hills or through corners where visibility is limited.
In the province of British Columbia, it is against the law to touch or cross solid double yellow line at any time, except to avoid obstructions on the highway, or when a vehicle is entering or exiting the highway, if the vehicle can safely do so without affecting the flow of other vehicles.
Yellow road lines are used in areas with large amounts of snow use yellow lines in the centre of the road to contrast the white colour of snow These lines are white in areas where there is infrequent or no snow
A double yellow line is a painted marking between opposing sides of a highway. It consists of two parallel, solid yellow lines located between the two directions of traffic flow and its presence usually indicates a no-passing restriction or no passing zone. Obvious exceptions to this no-passing restriction include emergency maneuvers or temporary traffic flow changes due to road work. Often the double yellow line has sections where one of the lines becomes dashed (in which case it is no longer a "double yellow"), indicating to the drivers traveling on the side closest to the dashed line that they may pass when it's safe.
In some states, it is not against the law to overtake vehicles in the presence of solid yellow lines if it is safe to do so. For example, Vermont State Law also allows passing across the double yellow line when no traffic is on the opposing side, however, one must pass quickly and return to the proper side.  Pennsylvania does not permit passing on double yellow lines when not also posted with "Do Not Pass" signage.  However, this is unusual as most states have a ban on crossing a double yellow line except when turning, when passing pedestrians or bicycles, or if an obstruction in the road makes it necessary. Overtaking another vehicle across a solid yellow line is usually considered a serious traffic violation in most states. 
Some parts of the US use a doubled set of double yellow lines to demarcate a painted median strip, which vehicles are not permitted to cross. This differs from a single set of double yellow lines, which may be crossed in certain circumstances.
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- "Waiting and parking (238 to 252)". Retrieved 2013-04-30.
- "Road markings" (PDF). direct.gov. Retrieved 2010-04-01.
- "Road Traffic Act 1960 - 51 Traffic signs". Legislation.gov.uk.
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Mr. Marples: Double yellow lines on the carriageway in a parking meter zone indicate a ban on waiting at all times, except for the picking up or setting down of passengers; they also indicate a ban on loading or unloading between 8.30 a.m. and midnight. I have authorised the use of these carriageway markings under the powers given to me in Section 51 of the Road Traffic Act, 1960.
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