Broken Glass

Flat tires on my bike.  What a pain.  This past October I had two flat tires.  Here is the culprit in my flat tires, broken glass.  Once it gets a hold on my tire, it works it's way up through the tire.  When it gets thru the inside of the tire, it punctures the inner tube and the tire goes flat.  This glass seems to be everywhere along the sides of the roads that I ride to work on.