<Table> <Tr> <Td> </Td> <Td> This article does not cite any sources . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (October 2007) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article does not cite any sources . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (October 2007) (Learn how and when to remove this template message) </Td> </Tr> <P> In the United States and Canada, a diamond lane is a special lane on a street or highway that is reserved for specific types of traffic . These lanes are usually marked with white diamonds or lozenge, hence their name . Diamond lanes are generally the right-most or left-most lane on the road . They are usually implemented to provide ways through traffic congestion, for safety reasons, and to encourage environmentally friendly transportation . A diamond lane may be intended for a specific type of traffic, or for several types . The intended use of a diamond lane is marked by traffic signs . In most areas, violating the rules of a diamond lane is punishable by a fine . </P> <P> Some common examples are: </P>

What does a diamond on the roadway stand for
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