Another difference between driving a car and driving a truck is FMCSR 392.14 which requires truck drivers to use "extreme caution" in weather that effects visibility or traction. Truckers are trained, through the Commercial Drivers License Manual and presumably their company, that they must use extreme caution in bad weather. Those truck drivers that cause a wreck by ignoring their training, failing to pull off or even slow down, must be held accountable.

In Weaver v. Chavez, decided 11/7/05, a district appeals court in California held that a trial court’s failure to instruct the jury on the standard of care of "extreme caution" in adverse weather, pursuant to 49 C.F.R. § 392.14, rather than the negligence standard under state traffic law, was reversible error.