Thomas Built Buses adds electronic stability control, other new options
The OEM will offer electronic stability control for the Saf-T-Liner C2, Bendix air disc brakes for the EFX and a severe duty harness for the HDX and EFX.

SmartTrac electronic stability control is a new option for Thomas Built’s Saf-T-Liner C2 school buses (pictured).
HIGH POINT, N.C. — Thomas Built Buses has teamed up with Meritor WABCO to offer new factory-installed SmartTrac electronic stability control (ESC) on its Saf-T-Liner C2 school buses.
SmartTrac ESC is a vehicle safety system that intervenes automatically when it senses instability that could lead to rollover or loss of bus control.
“When faced with rollovers and loss-of-control accidents, drivers normally are not aware that vehicle dynamics are about to become critically unstable until the point of no return is already reached,” said Stephen Hampson, president and general manager for Meritor WABCO.
Hampson explained that SmartTrac ESC uses various sensors to compare the vehicle’s actual movement to performance models. The system works with the Saf-T-Liner C2’s air disc and air drum brakes.
“If the vehicle shows a tendency to leave the driver’s intended path or exceeds a critical acceleration threshold, SmartTrac ESC helps the driver maintain control,” he said. “The system applies the appropriate brakes selectively and better aligns the vehicle with the driver’s intended path of travel.”
In addition to SmartTrac ESC, Thomas Built Buses will introduce Bendix ADB22X air disc brakes for Saf-T-Liner EFX school buses in the fourth quarter of this year. Thomas Built’s C2 and HDX school buses already offer the Bendix air disc brakes.
Company officials said that the ABD22X air disc brakes offer enhanced control, shorter and safer stopping distances, longer life and improved performance over standard brakes.
In early 2016, Thomas Built will also introduce severe duty chassis harness protection for the HDX and EFX. The new severe duty harness, already an option for the C2, is an upgrade for the main chassis electrical harness that protects the electrical system from water and debris. Company officials said that the severe duty harness is made of durable braided nylon that allows water and debris to pass through instead of becoming trapped.
“All three of these innovations are testaments to our commitment to continuous improvement,” said Caley Edgerly, president and CEO of Thomas Built. “We are dedicated to building and designing buses that are safe, efficient and provide our customers the lowest total cost of ownership possible. These innovations help us do just that.”
For more information about SmartTrac ESC, ADB22X air disc brakes or the new severe duty harness, customers can speak with a Thomas Built dealer.
More Safety

School Bus Laws to Watch: New York Delays EV Mandate
Plus, federal lawmakers seek new funding for school bus safety as states weigh stop-arm enforcement, disability protections, and education spending.
Read More →
The Essential Handbook for Safe Alternative Student Transportation
Your district's "exception riders" — students with IEPs, those experiencing homelessness, foster care youth — deserve more than a middleman solution. This handbook breaks down exactly what to look for in a supplemental transportation partner: from driver vetting and regulatory compliance to proactive safety technology. Because getting a ride isn't the same as getting a safe one.
Read More →
Operation STEER Brings Emergency Response Training to North Texas
Prosper ISD hosted the third annual training for transportation professionals across 67 districts to learn how to respond to emergencies, such as rollovers and evacuations, and proper use of safety equipment.
Read More →
Florida District Relaunches BusPatrol School Bus Camera Program With New Safeguards
After being suspended over due process concerns, Miami-Dade schools and law enforcement are restarting the AI-powered stop-arm camera program with new oversight.
Read More →
School Bus Laws To Watch: Seat Belt Bills, Funding Fights & EV Changes
From national bills on seat belts and driver oversight to driver awareness campaigns referencing “Finn’s Rule” and ongoing transportation funding debates in Alaska, here’s the latest in school bus legislation across the U.S.
Read More →
9-Year-Old Boy Killed by School Bus at Busy Brooklyn Intersection
A Williamsburg community is mourning after a child was fatally struck by a private yeshiva bus, prompting calls for urgent safety improvements at the high-traffic crossing.
Read More →
Does Reliable School Transportation Boost Attendance? EverDriven’s Data Says Yes
The new data shows 99.99% incident-free trips and strong on-time performance, reinforcing how dependable transportation, especially for vulnerable student populations, can help districts combat chronic absenteeism.
Read More →
What Data Shows About Student Transportation in 2026
Driver shortages, safety expectations, and staffing limits define student transportation in 2026. New survey data shows how fleet leaders are responding.
Read More →
NTSB Calls for Alcohol Impairment Systems, Seat Belts After W.V. Crash Investigation
The federal agency's report asks NHTSA to require all new school buses to be equipped with vehicle-integrated alcohol detection systems and passenger lap-shoulder belts.
Read More →
2026 State of Student Transportation Report
Student transportation teams are being asked to do more with less, facing driver shortages, rising costs, and increasing safety expectations. This report uncovers how fleets are adapting, where technology is making the biggest impact, and why student ridership tracking is emerging as a top priority. Download the report to explore the key trends shaping 2026 and what they mean for your operation.
Read More →

