The IIHS just published the results of their study of large trucks and crash risks. Topics covered include:

• Vehicle violations raise crash risk: Having vehicle defects of any type raised crash risk.
• Tired truckers and short-haul exemption are factors:  Although short-haul drivers must comply with federal rules on work and rest times, they don’t have to record their service hours.

Read more here: Safety defects and long hours contribute to large truck crashes, Status Report, Vol. 51, No. 10 | December 8, 2016