Under what circumstance is it legally and practically appropriate to use a vehicle's Hazard Warning Lights (four-way flashers)?

1. When driving through rain or fog to show other cars you are moving
2. When the vehicle is broken down, disabled, or stationary in a hazardous position causing a temporary obstruction
3. When parking illegally in a 'No Parking' zone to avoid getting a ticket
4. Whenever traveling faster than the posted speed limit