When backing up more then 30 ft. you are required to activate your hazard lights when backing up. So yes, if you are backing up 100 ft. you have to use your hazard lights.
Hazard Lights
Drivers should turn on their hazard lights when backing up if they are in a situation that may pose a hazard to other road users, such as backing out of a parking space in a busy area or when visibility is limited. This alerts other drivers and pedestrians of the vehicle's movements, enhancing safety. However, it’s important to ensure that the hazard lights are used appropriately and not as a substitute for proper signaling, such as using turn signals when necessary.
of course they do
Hazard lights may only be used during an emergency where the vehicle requires to be stopped in places it should not normally be stopped, such as a highway. People mistakenly used hazard lights when driving through heavy storms as another form to ensure visibility and is not recommended.
Driving so fast that your headlights do not give you enough warning to avoid a road hazard.
Hazard lights should only be used when your car is stopped or coming to a stop. Using them while you are actually still driving can be dangerous. Other drivers will be unable to tell if you are going to change lanes or get off the road because your turn signals or 'blinkers' will not work when your hazard lights are on.
During a road test, it's generally not required to use hazard lights when parking. However, you should signal your intentions clearly using turn signals when approaching a parking spot. Always check your local driving regulations, as requirements can vary by location. It's best to demonstrate safe and cautious driving practices throughout your test.
Doesn't have hazard lights.
It is the fuse for the hazard lights or as they are sometimes called, emergency lights.
Your owner's manual will list possible problems that such a signal can indicate. In addition be sure you did not accidentally turn the hazard lights on.
If this occurs under heavy braking (i.e. ABS has kicked in), then the hazard lights will start flashing. They will turn themselves off after a few seconds of normal driving. If it occurs whilst generally driving along, it could be a bad connection in the hazard light switch, or something more technical inside the car itself.
On an average car, there are high and low beam lights for night driving, clearance lights on the front and back, front and rear turn signals, and back-up lights used when backing up.