Going south on I25 today headed to Colorado Springs, got to the Briargate interchange riding in the fast lane, and had an idiot merging onto the highway try not once, but twice, to go from the on-ramp to my lane. I knew it was going to happen and had room to slow/accelerate/maneuver. First time she tried coming over I laid into the horn pretty good (Stebel clone mounted on passenger side of bike). Second time I laid into the horn for the entire length of time I was next to her. I think she got the message.