A combination vehicle on slippery roads should be driven:
Correct. Reduce speed by at least one third on wet roads and one half on snow; double following distance on slick surfaces.
CDL Practice Question #195
Category: Combination Vehicles
Why this question matters
This question is one of 55 in our Combination Vehicles bank. The reasoning above comes directly from the AAMVA CDL Manual, the source document used by every U.S. state DMV. Memorizing the underlying rule — not just the letter answer — is what separates passing on the first attempt from a return trip and another fee.