One of the things that helps is a responsive government.
Much of my riding is on rural roads, and I just get used to the occasional piles of glass. I've picked up intact bottles from time to time before they became flat tires. And I found this on a well used local bike path... decided I might as well do some cleaning.
Anyway, along one of my regular routes I found about 3 miles of what appeared to be window glass scattered along the road in a place that might get sweeped once a year.
Needless to say I wasn't happy.
I sent notes to the county and to a local cycling advocacy group, and the glass was gone within a week.