NHTSA Proposes Stability Controls for Trucks, Buses

Large buses and heavy-duty trucks sold in the U.S. will need electronic stability control systems under rules proposed by the National Highway Traffic Safety Administration.

The standard would apply to buses and truck tractors with a gross vehicle weight rating of more than 26,000 lbs. NHTSA proposes technology that can enhance roll and yaw stability by modulating engine torque and applying wheel brakes, including trailer brakes, individually.

Only two suppliers, Bendix and Meritor WABCO, currently make ESC systems for heavy trucks and large buses, according to the agency.

NHTSA estimates that ESC systems would eventually prevent as many as 2,300 heavy truck and bus crashes annually, thus eliminating 650-860 injuries and 49-60 fatalities each year. It figures the rule would cost truckmakers about $114 million per year.

The standard could prevent roughly 56% of rollover crashes and 14% of loss-of-control crashes, according to the agency. It notes that ESC system are already available as optional equipment on many heavy trucks and buses. NHTSA estimates that 26% of new truck tractors and 80% of new buses sold in 2012 will be equipped with ESC systems.

The proposed standard would take effect two to four years after being adopted, depending upon the type of vehicle. NHTSA will collect public comment on the rule for 90 days and intends to schedule a public hearing on the measure later this summer.

Details about the regulation can be downloaded HERE.