The switch can be directly joint into double flash (three feet were joint left turn light line, right turn light line and flasher L back line can).
According to the fault and pull over and open the double jump lamp to alert to the rear of the car.
Can be trailer when open.
Motorcycle broke down on the road, open double jump lamp warning back through the car, reduction through, pay attention to avoid!
Can also be expressed as the team make other vehicles notice at the same time can also be convenient your vehicle discrimination.
The bad: no steering priority function,(open double flash need to play steering, the double flash switch off can open turn light)
If with more than 30 yards of speed,steering without clear steering priority is very dangerous.