What is NOT considered an onboard safety technology?

Answer: D — Trailer seal

Onboard safety technologies are systems integrated into vehicles to enhance driver and passenger safety by providing alerts, assistance, or automated functions. Lane departure warning systems alert drivers if their vehicle unintentionally drifts out of its lane, significantly improving road safety. Adaptive cruise control automatically adjusts a vehicle's speed to maintain a safe following distance from the car ahead, adding an additional layer of safety during highway driving. Vehicle stability systems help prevent loss of traction and control, especially in adverse driving conditions, thus promoting vehicle stability and driver safety. In contrast, trailer seals do not fall under the category of onboard safety technology. Instead, trailer seals are used for security and to ensure that loads are not tampered with during transport. While they play an important role in overall freight security, they do not contribute to the active safety of the vehicle or its occupants, hence why they are not considered onboard safety technology. This distinction helps reinforce the importance of understanding what qualifies as a safety feature versus an operational or security component within the trucking industry.