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diamond lane

American

noun

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

First recorded in 1985–90

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diamond lane

The vehicle blocked traffic in the diamond lane.

From Seattle Times ● Nov. 19, 2023

To meet federal requirements, a diamond lane must move at an average of 45 mph during peak commute hours.

From Los Angeles Times ● Sep. 17, 2018

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023