A diamond-shaped marking on the left lane shows that:

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The lane is reserved for trucks and heavy vehicles.
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This is an emergency-only lane.
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The lane is reserved for car-pool vehicles.
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The lane is reserved for state-owned vehicles.
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Explanation
A white diamond-shaped marking on the road indicates that the lane is reserved for specific types of vehicles, such as buses or carpools (HOV). These markings are used to identify restricted-use lanes and help manage traffic flow.
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