In the United Kingdom, the Isle of Man and Ireland, it indicates that parking or waiting at that roadside is prohibited at certain times of day.
In the Channel Islands, a yellow line parallel to the road indicates no waiting (in Jersey) or no stopping (in Guernsey) at any time of day.
[citation needed] In Malta for example, a single yellow line, means no waiting (i.e. no parking, but alighting of passengers is permitted).
[3] In Malaysia, single yellow lines are used on most roads leading to cities or towns or busy areas to mark parking restriction for certain times.
In New South Wales, Australia, a broken single yellow line next to the kerb indicates a clear way, where parking is strictly prohibited during certain times of the day and/or special events.
[4] Single yellow lines are also used in areas with high snow fall to mark the far left side of the road.
[citation needed] In many continental European countries like the Czech Republic, Italy, Germany, France, Belgium, Poland, Slovakia and The Netherlands yellow lines aren't used for regular traffic regulation.
In Switzerland, yellow lines are used to delineate special lanes for specific types of vehicles, such as buses, taxis or bikes.
[11] In Canada, a single broken yellow line is used to separate traffic coming from opposite directions and means that passing is allowed.
In the United States, single solid yellow lines are expressly prohibited on two-way undivided roadways by Section 3B.01 of the Manual on Uniform Traffic Control Devices.
[12] Section 3B.06 authorizes use of a single solid yellow line in only two contexts: on divided highways (that is, divided by a median strip) to mark the left side of the lane closest to the median (for traffic in both directions), and to mark the left side of the leftmost lane on one-way ramps.
[citation needed] In Lebanon, crossing a yellow line means you entered the area where traffic is coming from the opposite direction.
There are four major exceptions to the rule against crossing a double yellow line: (1) turning left into a side street or driveway; (2) passing bicyclists or pedestrians (where they are obstructing through traffic on roads lacking a shoulder and/or a bike lane); (3) emergency maneuvers; and (4) temporary traffic flow changes due to road work.
[12] Two municipalities in the state of Rhode Island—Bristol and Warwick—replace the double yellow line with red, white, and blue striping along certain routes.
Double yellow verge lines as a parking restriction were first introduced in the UK by section 51[21] of the Road Traffic Act 1960[22] (repealed in 1972 and replaced by later legislation).
Double yellow lines mean no waiting at any time, unless there are signs that specifically indicate seasonal restrictions.
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.
[24] 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 (and the sign plates may be omitted).
[26] Hexavalent chromium in dust can cause dermatitis ulceration on the skin, inflammation of the nasal mucosa and larynx, and lung cancer.