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Question:

Which of the following CANNOT be checked at the same time?

A Brake lights, turn signals, and four-way flasher functions
Explaination

In Step 5 (Walk-Around Inspection) of the Seven-Step Inspection Method, you walk to the front of your vehicle to check that the turn signals and four-way flashers are working. Obviously, you can't check all your brake lights from that vantage point.