I have a path like that nearby, and I never thought about it when I had a gravel bike and 32c tires. Now that I have 25c road tires, it just freaks me out. I stopped down a few times to look at conditions (it's good for walking and sight seeing too), and paid attention to people's tires. 99% of bikes that I see, even if they have drop bars have at least 32's. I see a lot of partially buried rocks where there's like an inch of pointed, exposed rock.