I've done that actually. Was following a guy I thought was seriously drunk. He was all over the road from white line to white line. I stopped, pulled out my cell phone, dialed the cops, flipped up my modular, stuck it into my helmet, lower the front to help with wind noise and took off after the guy. Not the easiest thing to do. I pulled up beside him at a light. He said he hadn't slept in about 3 days and was seriously tired. I told him to pull over and take a nap. He actually listened.