An orange and red triangular sign on a vehicle means:

Work zone ahead.
Slow-moving vehicle.
You must yield the right-of-way to that vehicle.
Do not pass.
Explanation

Vehicles that can only travel below the average speed limit, such as farm vehicles or road maintenance vehicles, must display an orange and red triangular sign on the rear. These slow-moving vehicles are typically only allowed to operate during the day unless they are equipped with the proper lights and reflectors for nighttime travel.

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