i'm mostly in the right lane, and find that i need it more on the left side. I saw him inching over and flashed before hitting the horn. I usually refrain from using the horn and go with it, but from now on I'm letting them know when they're doing something wrong, with hopes they'll pay more attention.
and no, I didn't give him the finger, just pointed to the camera and did the "nuh unh unh" sign