How often do roadside inspectors find this part defective, and how often is the truck pulled off the road?

Among 5,376,769 roadside inspections of commercial trucks, inspectors wrote 40.6 lights violations per 100 inspections, and 12.6% of them took the truck out of service on the spot.

Commercial truck roadside inspections: violations on the lights and how often they pulled the truck off the road (tractor-trailers, buses and other heavy commercial trucks; not cars or pickups)

What it shows: Tires is the largest at 62.4%, followed by Brakes at 21.1%; the smallest shown is Exhaust at 4.8%.

Source: FMCSA roadside inspections and violations, U.S. DOT data.transportation.gov · downloaded 2026-10-05

Data and chart by CalcScrape: Headlight Replacement Cost Calculator