What is the purpose of the stop arm on a school bus?

a.To help students cross the street

b.To extend outward and signal traffic to stop when the bus is loading or unloading

c.To block the bus door

d.To act as an emergency brake

Explanation

The stop arm swings out from the left side of the bus when the door is opened. It provides an additional visual signal to traffic that they must stop because students are loading or unloading.

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About the CDL Exam

The CDL (Commercial Driver License) exam tests your knowledge of commercial driving rules, safety procedures, and vehicle operation. You must score 80% or higher to pass the written knowledge test. The exam covers general knowledge, air brakes, combination vehicles, and various endorsements.

This question is from the Bus Endorsement Test #1 section. Practice with more questions from this category to build confidence before taking the official DMV test.

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