A conviction in this category can cost a commercial driver income quickly because it can trigger a CDL disqualification, raise insurance costs, and become damaging evidence after a crash. If an injury claim follows a wreck on a busy corridor such as Route 3 or I-93, a prior or current serious violation may be used to argue careless driving, negligent hiring, or weak fleet supervision.

For CDL purposes, a serious traffic violation is a specific offense listed under federal commercial-driver rules, not just any ticket. Under 49 C.F.R. § 383.51, examples include excessive speeding, reckless driving, improper or erratic lane changes, following too closely, and using a hand-held mobile telephone while driving a commercial motor vehicle. Driving a commercial motor vehicle without first obtaining the proper CDL, or without the correct class or endorsement, can also count. New Hampshire follows these federal standards through its CDL laws and enforcement by the New Hampshire Division of Motor Vehicles.

The practical consequence is cumulative. A commercial driver who is convicted of two serious traffic violations arising from separate incidents within three years faces a 60-day disqualification; three within three years brings a 120-day disqualification under 49 C.F.R. § 383.51. In an injury case, that record can affect liability, settlement value, and claims against an employer for negligence or negligent entrustment if the company kept a driver on the road despite a risky history.