Electronic stability control proposed for buses, coaches

The National Highway Traffic Safety Administration (NHTSA) proposed a new federal motor vehicle safety standard to require electronic stability control (ESC) systems on large commercial trucks, motorcoaches, and other large buses for the first time ever. Agency research shows the technology could prevent up to 56% of rollover crashes each year — the deadliest among all crash types — and another 14% of loss-of-control crashes.

An extensive NHTSA research program to determine how available stability control technologies affect crashes involving commercial vehicles found ESC systems to be the most effective tool for reducing the propensity for heavy vehicles to roll over or lose control. With sensors that monitor vehicle movement and steering, ESC can help mitigate rollover incidents by using automatic computer-controlled braking, and also aid the driver in addressing severe understeer or oversteer conditions that can lead to loss of control. NHTSA estimates that a standard requiring ESC on the nation's large trucks and buses would prevent up to 2,329 crashes, eliminate an estimated 649 to 858 injuries, and prevent between 49 and 60 fatalities a year.

"We've already seen how effective stability control can be at reducing rollovers in passenger vehicles — the ability for this type of technology to save lives is one reason it is required on cars and light-duty trucks beginning with model year 2012," said NHTSA Administrator David Strickland. "Now, we're expanding our efforts to require stability enhancing technology on the many large trucks, motorcoaches, and other large buses on our roadways."

While many truck tractors and large buses can currently be ordered with this technology, the proposed standard would require ESC systems as standard equipment on these types of vehicles. As proposed, the rule would take effect between two and four years after the standard is finalized, depending on the type of vehicle.

The agency's Notice of Proposed Rulemaking is being published in the Federal Register and members of the public will have the opportunity to comment on the proposal for 90 days. NHTSA will also hold a public hearing on the proposed safety standard to solicit further public comment — the date and location of that hearing will be published in the coming weeks.