A woman driving on a Houston freeway was killed in this manner a few years ago. It happened again but I think the man was not killed. Kids prank turned deadly. Lock the little sob's up in detention.
They should put fencing on the overpasses close to town.
We had the same problem in the DC metro area back in the early- or mid-70s, so highway crews had to cage in the overpasses with chain link fencing in "certain"-demographic areas. A woman was killed in one incident, and IIRC others were injured. Snipers watching the overpasses might work...