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

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This is an emergency-only lane.
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The lane is reserved for trucks and heavy vehicles.
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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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Other questions in the same category: Pavement Markings
‘Sharrows’ are:A _______ line marks the left edge of the pavement on divided or one-way roadways.You may not cross a single broken white or yellow line:One broken line indicates:Drivers may not cross ______________ unless turning left when it is safe to do so.____________ separate lanes of traffic moving in opposite directions.A solid double yellow center line means:A solid yellow line next to a broken yellow line means that vehicles:A broken yellow line between two lanes of traffic means:A double solid yellow line in the center of a two-lane road means:
This question appears in the following DMV practice tests: