Gravel truck slinging rocks

About a month ago, I got a new windshield put in my car. On my way home from school yesterday, I passed a gravel truck who was slinging rocks everywhere. As soon as i got next to him five rocks hit my windshield, but the last one busted it. I went to go get it fixed, but they said they could not fix it because it was a perfect circle and if they tried that part of the glass could come out. The only bad part is that if it starts to run, I will have to put a new windshield in my car again just to get a new inspection sticker. Is there any thing we can do about the gravel truck slinging rocks everywhere? If you have any suggestions let me know.