Final answer:
We are allowed to use hazard lights/4-way flashers at a railroad grade crossing, to warn other motorists of a hazard, when the bus is disabled due to breakdown or accident, and during a backing maneuver.
Step-by-step explanation:
The circumstances under which we are allowed to use hazard lights/4-way flashers are:
- At a railroad grade crossing.
- To warn other motorists of a hazard.
- When the bus is disabled due to breakdown or accident.
- During a backing maneuver.
- All of the above.
Hazard lights should only be used in emergency situations or to warn other drivers of potential danger. It is important to follow traffic laws and use hazard lights responsibly.