Hi there!
The first time I bought some, the man who loaded it told me he would have glass stuck in his tire treads when he got home. The roads at the dump had glass mulch as their "gravel." He didn't seem to have a problem with it. There were cars and trucks going all day out there over the glass. It's about the same size as gravel if that helps...and the first time I used it, I put it on top of the gravel on the pathway.
All the glass I've seen like Bubbles, you could even walk on it barefoot. Well, I guess I should say if you can walk on gravel barefoot and many people can and I think the glass is even smoother.
We're just getting ready to go the dump....why...to get glass. DH is "thrilled" to have another opportunity to shovel glass in the heat. He really is a trooper. I'll get some pics for Becky of where we get the glass, and what it looks like before the sand is washed out of it. Too bad I can't let her smell it!