What vehicles are allowed to operate with both amber and white warning lights?

The correct answer indicates that any vehicle over 80 inches in width can operate with both amber and white warning lights, provided it meets specific requirements. This is crucial because amber lights are typically used to signal caution, while white lights can also serve as a visible warning to other road users about the vehicle’s size and presence, especially on larger vehicles such as trucks or construction vehicles.

In New Hampshire, regulations allow wider vehicles that may pose a hazard on roadways to utilize these lights to enhance visibility and increase safety, especially when navigating through heavy traffic or construction zones. The inclusion of specific requirements ensures that not just any oversized vehicle can operate with these lights but rather those that are compliant with safety standards.

Other options, while they do mention various vehicle categories, do not specify the broad criteria of width and compliance with regulations essential for the use of both amber and white lights. This specificity is key to ensuring safety on the roadways, which is why option B is the most accurate choice.