I hardly get tailgated or flashed, I guess one of the advantages of driving a vehicle with some "street cred" and image. But when I do, I just flip on my rear fog lamps or sometimes I indicate right and the do the most slowest lane change im the history of the world, which annoys them even more! LOL In most cases I just ignore the fool. Then then undertake me, and when some one slows down next to me, as if looking for trouble, one " you wanna get some of this" look is enough for them buzz past me