Never drive a tank vehicle with open valves or:

Open manhole covers. Section 8.1.2: Never drive a tank vehicle with open valves or manhole covers.

Never drive a tank vehicle with open valves or:

ANSWER BREAKDOWN
  • A. Incorrect. "Open windows" is not correct. Never drive a tank vehicle with open valves or manhole covers.
  • B. Correct. Never drive a tank vehicle with open valves or manhole covers.
  • C. Incorrect. "The radio on" is not correct. Never drive a tank vehicle with open valves or manhole covers.
  • D. Incorrect. "The heater on" is not correct. Never drive a tank vehicle with open valves or manhole covers.