The Federal Rules That Decide Truck Cases
Alcohol and the four-hour rule
A commercial driver cannot drink within four hours of going on duty, cannot register any alcohol concentration while on duty, and a carrier commits its own violation by putting a driver to work who appears to have been drinking inside that window (49 CFR 392.5).
Drugs and impairing medication
Being on duty while using Schedule I drugs, amphetamines, narcotics, or anything else that compromises safe driving is prohibited, and the carrier may not allow it (49 CFR 392.4). A prescription only helps where a medical practitioner has confirmed it will not impair driving.
Identifying the carrier from the truck
Both sides of a commercial vehicle must carry the operating carrier's name and USDOT number, readable from 50 feet, and a leased truck running under another company's name has to add 'operated by' with that carrier's details (49 CFR 390.21). A single photograph of the door is frequently how the right defendant gets identified.
Higher limits for hazardous loads
Interstate carriers running general freight must hold $750,000 in liability coverage as a floor. Hazardous loads sit higher: $1,000,000 for many of them, and $5,000,000 for certain bulk hazardous substances (49 CFR 387.9). The tankers on I-215 belong to those upper tiers. Our Utah truck accident claims guide goes further.
If the truck leaves the scene
If a truck causes a crash and keeps going, uninsured motorist coverage may respond. Where it never made contact, Utah Code § 31A-22-305(6) demands clear and convincing corroboration beyond your own account that the vehicle existed, so anything you noticed on the door matters.