A judge said two drunken men who bombarded passing cars with rocks could have killed someone.
Intoxicated Tyler Horseman and Bradley Wiltshire were heard "laughing and cheering" when they launched the missiles over a garden fence onto the A39 near Bristol, smashing the windscreens of vehicles. But they were both crying when a judge sent them into custody.
Horseman, 18, of West Tyning in Marksbury and Wiltshire, 26, of Tamworth Road, Keynsham, both pleaded guilty to causing a danger to road users. They also admitted assaulting an emergency worker following the incident in September last year.