E. LearndmvDMV PRACTICE
Find your state Exam types Practice tests Sign in Create account ↗
Practice quizzes / Ohio CDL Doubles and Triples Endorsement Test Practice Questions - Ohio CDL Doubles and Triples Endorsement Test Exam / Question 158287
Practice question

Which glad hand color normally identifies the service or control air line?

  1. Blue glad hands normally identify the service or control air line.
  2. emergency line
  3. battery box
  4. drawbar eye

Answer: A — Blue glad hands normally identify the service or control air line.

The correct answer is shown above. Try the full quiz for additional practice.

Practice more: Ohio CDL Doubles and Triples Endorsement Test Practice Questions - Ohio CDL Doubles and Triples Endorsement Test Exam →
Learndmv.

Thoughtful practice for the road ahead. Find permit, road signs and CDL preparation by state.

Explore

Practice by stateAll practice testsExam types

Your account

My profilePractice historyAccount security

Get started

Create accountSign inSitemap
© 2026 LearndmvIndependent practice resource · Not affiliated with any state DMV.