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What does a white diamond posted at the side of the road or painted on the road surface mean?

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A diamond signifies a carpool lane. These typically required 2 or more people to be in the vehicle, although some places may require 3. Some carpool lanes are only in effect during certain hours, some are 24/7, so be sure to check for signs as you're driving for the specific rules on the specific freeway you're traveling.

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Car pool lane

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Stay off the road please.
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