What does your local law say about using your flashers?
Most states say "You should turn on emergency flashers or hazard lights only when you need to warn other drivers of an emergency or a traffic hazard"
Making a delivery or taking your lunch in a legal parking place is not an emergency or hazard.
Same thing goes for using your horn. On every safety ride my sup said I need to honk my horn when I roll up to a delivery. I replied I do not think it is a emergency when delivering a package. I told them to feel free to write me up for it and I will take it to the local tv station that UPS wants me to break the law and is disciplining me for not breaking the law. Sup said UPS supersedes local laws I said lets find out. Sup's never put it to paper because they new I would make a big deal out of it.