Single paceline, tooling along nicely just to the left of the white line where we were supposed to be. Guy in a small pickup is pulling out and turning right. He waits for us to go by, pulls out, passes us, moves over in front of the line and slams on the brakes. Lead rider went left, number two went right into the ditch and number three went into the tailgate (which was down), over it and into the bed of the truck . The driver started to take off, realized number three was still in the bed of his truck, gave him a couple of secs to roll back out of the bed, then took off. In the stunned confusion up front no one managed to get the tag number, so the guy was never caught as far as I know.