Section 456. Location of magazines

The quantity of explosives that may be
  stored in any explosives factory  or  magazine  shall  depend  upon  its
  distances  from  the  nearest  building,  railroad  or  highway or other
  magazine. The distances that a quantity of explosives may be stored from
  the nearest  magazine,  building,  railroad  or  highway,  shall  be  as
  determined  by the regulations promulgated pursuant to this article. All
  such distances may be reduced  one-half  when  the  magazine,  building,
  railroad  or  highway  to  be  protected is adequately screened from the
  explosives factory or magazine by an efficient barricade as  defined  in
  subdivision seven of section four hundred fifty-one of this article.