Anyone in here who uses light bars?

I have been shopping for one so when I have to back up on a main road way to get into a spot I can shoot the lights on so people will back off so I can do what I can do..or..that's that I am hoping that will happen backing up a 18foot trailer that side walls that are 7 feet high is not fun when you have people zooming past you like crazy!!



Anyone know a cheap place to buy a full size light bar? New or used