Answer 1:

Cloudy day or evening when the brightness is not enough ( not dark to need the degree) I used to open the width lamp, it can prompt stop vehicle, and is mainly car dashboard and in control of the backlight is often bright design, so the light is not good when you can't remember exactly, but think again open width lamp words behind the taillights are also open will not affect the vehicle brake judgment for me.

 

Answer 2:

Sure. Three van so big ass, gas up dust slurry is easily attached to the rear window, a hatchback car is easy, so it is necessary to regularly scrape

 

Answer 3:

Width can make do with, but the actual significance of different. Daytime running light to engine only light, not in the group headlamps in general open daytime running lights off. Width indicating you can always open, even if the engine is not running