Handling & Stability
23 free questions, part of the Combination Vehicles CDL practice test
A combination vehicle is far more likely to roll over, skid, jackknife, or off-track than a straight truck, so handling it safely means managing speed, following distance, and steering inputs differently. These practice questions cover rollover risk, the space and following-distance rules for long rigs, backing technique, and how to recognize and recover from a skid or jackknife. ELDT.io's free bank has 23 handling and stability questions pulled from the AAMVA CDL Manual and 49 CFR 383.111.
This topic has 23 questions, split into 2 tests of 11-12 questions each:
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Why do loaded combination vehicles roll over more easily than empty ones?
A loaded trailer carries its weight higher off the road, and cargo that shifts or leans to one side adds extra tipping force in a curve or sudden move. That is why a fully loaded rig rolls over far more easily than an empty one, and why securing the load matters.
How much following distance should I add on a combination vehicle?
Start with 1 second of following distance for every 10 feet of vehicle length at speeds under 40 mph, then add 1 more second for any speed above that. A long rig needs the extra room built in before you need it, not after.
Which way do I turn the wheel to back a trailer to the left?
Turn the wheel the opposite way you would in a car. To send the trailer left, turn the wheel right first, then straighten out as the trailer starts moving the way you want, checking both mirrors the whole time.