Final answer:
The initial terminal and road air brake test is known as a Class 1 Air Brake Test, conducted to ensure commercial vehicles' air brake systems are functioning properly.
Step-by-step explanation:
The initial terminal and road air brake test is also known as a Class 1 Air Brake Test. This test is performed to ensure that the air brake system on a commercial vehicle is working properly before the vehicle is operated.
The process involves checking for leaks, ensuring that the warning system is functioning, and verifying that the brake system maintains air pressure under various conditions. A Class 1 Air Brake Test is essential for maintaining safety on the road for commercial drivers, as well as for those sharing the road with these vehicles.