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:b : a [[natural]] formation or [[structure]] that prevents or hinders movement or [[action]] <geographic barriers to [[species]] [[dissemination]]> <barrier beaches> <drugs that cross the placental barrier>
:b : a [[natural]] formation or [[structure]] that prevents or hinders movement or [[action]] <geographic barriers to [[species]] [[dissemination]]> <barrier beaches> <drugs that cross the placental barrier>
*2plural often capitalized : a medieval [[war]] game in which combatants fight on foot with a fence or railing between them
*2plural often capitalized : a medieval [[war]] game in which combatants fight on foot with a fence or railing between them
*3: something immaterial that impedes or separates : obstacle <[[behavioral]] barriers> <trade barriers>
*3: something immaterial that impedes or separates : obstacle <[[behavioral]] barriers> <trade barriers>
<center>For lessons on the [[topic]] of '''''Barriers''''', follow [http://nordan.daynal.org/wiki/index.php?title=Category:Barriers '''''this link'''''].</center>
==Description==
==Description==
''Automatic full barriers'' are a set of four half-barriers closing a road at a railway [http://en.wikipedia.org/wiki/Level_crossing level crossing].
''Automatic full barriers'' are a set of four half-barriers closing a road at a railway [http://en.wikipedia.org/wiki/Level_crossing level crossing].
