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diamond lane

a highway or street lane for buses and passenger vans marked with a large diamond shape on the pavement.
Origin of diamond lane
First recorded in 1985-90 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Contemporary definitions for diamond lane

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

See HOV lane's 21st Century Lexicon
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Slang definitions & phrases for diamond lane

diamond lane

noun phrase

A highway lane designated for ''high-occupancy'' cars, esp for carpool cars: The code in most states is that a carpooling vehicle can use the usually much faster diamond lane

[1990s+; because the lane is designated by diamond-shaped signs on the pavement]

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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