Rollover, Curves & Skid Control
13 free questions, part of the Tanker (N) Endorsement CDL practice test
A loaded tank vehicle has a high center of gravity, and the liquid inside keeps shifting even after you've started a turn, which is why tankers roll over at speeds a car would take without any trouble. The fix is to slow down before the curve, not during it, and to stay off the brake and the throttle once you're in the turn. ELDT.io's free bank has 13 practice questions on rollover and skid control.
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Start Class A CDL Theory ($15)Questions about Rollover, Curves & Skid Control
Can I trust the posted speed limit sign on a curve?
Not for a loaded tanker. Posted curve and ramp speeds are generally set for passenger cars, and a full tank's high center of gravity and shifting liquid make the same curve far riskier at that speed. Slow down below the posted speed before you enter the curve.
What usually causes a skid in a tank vehicle?
Overbraking, oversteering, and overaccelerating are the three driver inputs the CDL manual points to. On a tank trailer specifically, a skidding set of trailer wheels can swing the trailer around even if the tractor's tires still have grip.