When can a driver use a handheld device while driving a commercial vehicle?

Answer: C — Only in emergencies, as it is generally prohibited

The use of a handheld device while driving a commercial vehicle is generally prohibited to ensure the safety of the driver, others on the road, and the overall integrity of the transportation system. However, exceptions exist, and one of them is in emergency situations. The law allows drivers to use their handheld devices in emergencies where immediate communication is crucial, such as contacting emergency services or handling urgent situations that could impact safety. This highlights the commitment to safety while recognizing that there are scenarios where communication is necessary for immediate action. The other options do not reflect the legal and safety regulations surrounding the use of handheld devices in commercial vehicles. Using a device at any time or solely during long trips does not consider the urgent nature of emergencies that may arise. Additionally, using a handheld device while at traffic stops does not align with the intention of minimizing distractions, as the driver remains in control of the vehicle and must be prepared to drive at any moment. Thus, the appropriate context for using a handheld device is strictly limited to emergencies.