Well, kudos to you for stopping to check. Most people would drive on by, either out of fear or indifference.

I imagine you had your radar scanning for any funny business.

If in doubt, it would have been appropriate to contact the authorities, who are trained and paid to deal with funny stuff.

But regardless of those basic practicalities, it occurs to me that perhaps you planted a seed. A small, decent act can be paid forward in ways you can't imagine and won't see. It's an act of faith.

I sincerely hope you get your triangle back.