Practice question

Why is it unsafe to drive with open valves or manhole covers?

  1. Cargo can leak or spill, and PennDOT specifically warns never to do it
  2. It makes the tank too aerodynamic
  3. It cancels the CDL endorsement
  4. It makes the liquid less dense

Answer: A — Cargo can leak or spill, and PennDOT specifically warns never to do it

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

Practice more: Pennsylvania CDL Tanker Test Practice Questions - Pennsylvania Commercial Driver License (CDL) Tanker Vehicles Endorsement Test Exam →