Which of the following is NOT exempt from having a mud flap?

The correct choice indicates that a trailer with two tires is not exempt from having a mud flap. This is based on the vehicle regulations that are designed to prevent debris and water from being thrown up by the tires, which can cause hazards for other vehicles and pedestrians.

In many jurisdictions, including Texas, specific guidelines outline that vehicles with a certain tire configuration must be equipped with appropriate mud flaps to protect road users. While certain vehicles like truck-tractors operated alone, pole trailers, or delivery vans may have exemptions due to their design or operational use, a trailer with two tires typically does not meet the criteria for exemption.

Mud flaps are essential for any vehicle that could potentially throw debris onto the roadway as they help maintain safety and vehicle integrity, making compliance with these regulations vital.