They re huge metal barriers; they re connected to one another and there s literally no gaps.

http://images.google.com.py/url?q=http://maquoketaschools.instructure.com/eportfolios/448/

http://google.la/url?q=http://howeisd.instructure.com/eportfolios/793/

http://google.kg/url?q=http://stpatrickhighschool.instructure.com/eportfolios/754/


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