I am travelling down the interstate when suddenly traffic comes to a halt or slows down significantly. My high visibility LED brake light is shining bright but until I am convinced that the traffic behind me is fully aware of the situation, I will flip on the four-way flashers. Good practice or bad practice? I recently became aware that its actually illegal in some places to have four-way flashers on while in motion. Don't really care about legality but rather in such situations, does it increase or decrease my safety? In addition, I am watching my mirrors and have my escape route planned.