Which item is essential for a commercial vehicle driver to have on board?

Having a safety kit with emergency supplies is essential for a commercial vehicle driver because it ensures preparedness for unforeseen circumstances on the road. This kit typically includes items such as a first aid kit, reflective triangles, flares, a flashlight, and basic tools. In case of an accident, breakdown, or any other emergency situation, these supplies can significantly enhance safety, facilitate communication for assistance, and assist in minor repairs or provide first aid.

While the other options may be useful, they do not encapsulate the broad range of safety and emergency preparedness that a safety kit offers. An extra tire, for instance, is helpful if a tire fails, but does not address other emergency scenarios. A spare fuel can may be beneficial in preventing fuel shortages, and a toolkit might be handy for on-the-spot repairs, but neither would provide the comprehensive support needed during various emergencies that might occur while driving a commercial vehicle.