diamond lane

noun
a highway or street lane for buses and passenger vans marked with a large diamond shape on the pavement.

Origin:
1985–90

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Dictionary.com's 21st Century Lexicon
Main Entry:  diamond lane
Part of Speech:  n
Definition:  a highway lane marked with painted diamonds which indicate that it is for multi-passenger vehicles, created to alleviate traffic congestion and improve air quality; also called HOV lane
Main Entry:  diamond lane
Part of Speech:  n
Definition:  See HOV lane
Dictionary.com's 21st Century Lexicon
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Example sentences
Choose carpool and move to the carpool diamond lane.
Therefore, the free flow travel time in the diamond lane may be higher than that specified for a physically separated lane.
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