Final answer:
In the backing section of the Washington CDL exam, requirements include being able to back through a course and maintaining complete control of the vehicle. Proper turn signal use is tested elsewhere, and driving the vehicle forward is not part of the backing section requirements.
Step-by-step explanation:
In the Washington CDL (Commercial Driver's License) exam, the backing section tests various skills to ensure that a driver can operate a commercial vehicle safely and competently. One of the requirements is that the driver must be able to back the vehicle through a pre-designated course, which assesses the ability to maneuver the vehicle in reverse in a controlled and precise manner. Another requirement is having complete control of the vehicle at all times, which demonstrates that the driver can handle the vehicle safely under different conditions.
However, using your turn signals properly is typically a requirement for driving on public roads and is tested in other sections of the CDL exam that evaluate a driver's ability to communicate intentions to other road users. Lastly, the requirement specified as (D) Drive the vehicle forward is not relevant to the backing section, as this section purely focuses on the driver's ability to handle the vehicle while it is in reverse.