that no one, in bad weather; or just 'rain'; should ever; put on their 'blinkers' while driving on 'road'. Please; do NOT do this. This on-road use of blinkers, against the law, actually; but many seem to think; they know better. When this MO eliminates all 'safe harbor' per getting of road in bad conditions - and where you DO put your blinkers on; so that other will know; you are in fact, 'OFF road'.
(Drivers using blinkers while moving; eliminate all safe escape options. A person who pulls to 'off road' or 'side of'; with 'blinkers' appropriately on; could just as easily have another car, ride right over them; thinking they were just following the 'blinking tail lights'.)
Forget the 'flashers' and use them only as legally advised. "OFF road'; and NEVER, when moving down the highway. Particularly and worst; in bad weather conditions.
An example would be a truck entering the highway where the entrance is on a steep uphill grade.
It is also good practice on really steep uphill mountain grades where speed is reduced to half of the rest of the traffic.
Wide load vehicles and the chase trucks use blinkers all the time. When you are stopped or travelling dead slow, it is best to put them on to alert other drivers that you are not traveling at a normal speed. AFAIK it is only illegal to use the blinkers when traveling at normal speeds or when traveling FASTER than the posted speed limit.