Final answer:
The correct answer is option 2) 80 inches or more. Trucks or buses are required to have clearance lights if their width is 80 inches or more.
Step-by-step explanation:
The correct answer is option 2) 80 inches or more. According to state law, trucks or buses are required to have clearance lights if their width is 80 inches or more. Clearance lights are important for larger vehicles as they help increase visibility and make it easier for other drivers to see the vehicle's width, especially at night or in low visibility conditions. These lights are usually placed on the top front and rear corners of trucks or buses to provide maximum visibility.
For commercial vehicles such as trucks and buses, state laws commonly mandate that if the vehicle's width is 80 inches or more, it must be equipped with clearance lights. These lights help in making such large vehicles more visible to other road users, particularly during poor visibility conditions. They are positioned on both the front and rear of the vehicle, outlining its width to alert other drivers of its presence and size, thereby enhancing safety on roads.