Final answer:
When a truck or bus is disabled on the roadway at night, one flare should be placed alongside the vehicle, with the other two flares placed 100 feet ahead and 100 feet behind to alert other drivers.
Step-by-step explanation:
If a truck or bus becomes disabled on the roadway at night, to ensure safety and to warn other drivers, three flares or reflectors must be positioned around the vehicle. When a truck or bus is disabled on the roadway at night, one flare should be placed alongside the vehicle, with the other two flares placed 100 feet ahead and 100 feet behind to alert other drivers.
The correct answer is: b. 100 feet ahead of your vehicle and 100 feet behind your vehicle. Placing one flare or reflector alongside the vehicle helps to make it visible to oncoming traffic. The other two should be placed 100 feet ahead and 100 feet behind the vehicle, to give approaching drivers ample warning and time to react, thus preventing potential accidents.