I try to use my engineering knowledge to design my own glass roadway panel to see what it would take and use that to determine how much it would cost.
Sources:
http://books.google.com.au/books?id=Xn8KbsgeFrwC&pg=PA170&lpg=PA170&dq=abrasion+tempered+glass+science&source=bl&ots=RmVkIms6nA&sig=tpzfv9K-tVbiLM5juoeIWC-_7gM&hl=en&sa=X&ei=88myU-_yNsiekQWO14HQCw&ved=0CBwQ6AEwAA#v=onepage&q=glass&f=false
http://www.lehigh.edu/imi/WinterSchool/Lectures/Lecture_11_Bao_Glass-Mats-In-Building.pdf
http://www.warmglass.com/phpBB/viewtopic.php?f=2&t=4961
http://www.colorado.edu/MCEN/MCEN2024/HW9wSolns.pdf
http://glassproperties.com/references/MechPropHandouts.pdf
Materials science and engineering an introduction eighth edition, Callister, Jr, William D