What must be indicated when a load extends beyond legal limits?

Answer: B — A 12-inch red flag

When a load extends beyond legal limits, it is essential to indicate this extension to ensure the safety of all road users. The use of a 12-inch red flag is a standard requirement in these situations. This flag must be displayed at the end of the load that extends beyond the vehicle. The red flag serves as a visual warning to other drivers, alerting them to the presence of an oversized load, which could potentially pose a hazard as it occupies more space than usual on the roadway. This visual indication helps to prevent accidents by making the oversized load more noticeable, especially in situations where visibility might be compromised, such as during inclement weather or poor lighting conditions. Properly marking the load with a red flag promotes compliance with transportation regulations and enhances overall road safety.