Practice question What should be verified about tank vents? They are clear and workingThey are plugged at all timesThey are removed before drivingThey are used as tie-down points Answer: A — They are clear and working The correct answer is shown above. Try the full quiz for additional practice. Practice more: Georgia CDL Tanker Test Practice Questions - Georgia Commercial Driver License (CDL) Tanker Vehicles Endorsement Test Exam →