In response to a tractor-trailer rollover that triggered a collision with a motorcoach, the National Transportation Safety Board repeated safety recommendations to deal with fatigued commercial drivers and to reduce the occurrence of fatigue in the first place.
NTSB on Feb. 2 wrote letters to the Federal Motor Carrier Safety Administration and the National Highway Traffic Safety Administration. The letters repeated NTSB’s Sept. 16, 2008, recommendations that:
NTSB also reiterated its recommendation that NHTSA determine rules on adaptive cruise control and collision warning system performance standards for new commercial vehicles. Those standards should address obstacle detection distance, timing of alerts, and human factor guidelines, such as the mode and type of warning, NTSB said.
A FMCSA spokesman said he had no comment about the NTSB letter.
A NHTSA spokesman said his agency has conducted a field test and collaborated on a study with Virginia Tech Transportation Institute. Those tests found safety benefits from using technology but presented different conclusions about the source of the benefits. Because of the different findings, the agency said it did not have “sufficient certainty about safety benefits … to justify rulemaking and is conducting additional work.”
– Staff reports
Affected trucks include model year 2008-2018 Freightliner Cascadia and Western Star 4700, 4900, 5700 and 6900 trucks. DTNA says after hard brake applications, the brake light pressure switch may not activate the brake lights with the light application of the brake pedal.