Q: Does defective equipment play an important role in truck crashes?
A: Yes. Institute researchers who examined crashes of large trucks in Washington State found that tractor-trailers with defective equipment were twice as likely to be in crashes as trucks without defects. Brake defects were most common. They were found in 56 percent of the tractor-trailers involved in crashes. Steering equipment defects were found in 21 percent of crash-involved trucks.