When are you required to complete a pre-hill inspection?

Completing a pre-hill inspection is essential when you encounter a posted sign indicating the need to check brakes before descending a steep hill. This requirement is based on the understanding that steep downhill gradients can significantly tax a vehicle's braking system, potentially leading to brake overheating and failure. The inspection process allows the driver to ensure that the braking system is functioning properly and that all components are in good condition, reducing the risk of accidents during the descent.

Performing this inspection helps to identify any potential issues with the brakes, such as wear or fluid leakage, which could compromise safety when navigating steep inclines. The signage serves as a crucial reminder for drivers, particularly with commercial vehicles, that the demands of operating a vehicle on steep terrain necessitate additional precautions.

While long-distance driving, entering a city, or suspecting brake issues could suggest the need for general vehicle inspections, the specific requirement to conduct a pre-hill inspection is directly tied to the conditions indicated by the posted signage in areas with steep gradients. This context underscores why the correct answer emphasizes adherence to signage related to safe operation in such environments.