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

The lane is reserved for trucks and heavy vehicles.
This is an emergency-only lane.
The lane is reserved for car-pool vehicles.
The lane is reserved for state-owned vehicles.
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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