Can you hear me now?

Dave Davis was driving over Berthoud Pass in Colorado with his father-in-law, Robert Johns, who was in the passenger seat. They came up to a slow moving vehicle and "tooted" their horn to have him move over. The slow driver didn't move, so Robert told Dave to pull up behind the vehicle. He then got out through the passenger door, climbed onto the fender of the slow moving vehicle and moved along the running board to the driver's door. He asked the driver of the slow moving vehicle; "Didn't you hear us back there?"

I bet after that the driver moved out of the way whenever someone wanted to get by.