I don't flash my lights or follow the directive of those that do.
Today I just don't trust other drivers. Some may have motives other than being helpful.
When passing I wait until I see I'm clear in my monitor and mirrors before pulling back into the right lane. And I don't have the distraction of watching for the flash or hitting an ICC switch.
Sarver, PA/Crystal River, FL/Shelocta, PA · FMCA 335149 · W3TLN
2005 Suncruiser 38R · W24, no chassis mods needed · 2013 Honda Accord EX-L · 2008 Honda Odyssey EX-L