Dado que ayer fue día de fútbol, aquí os dejo una foto que me recordó a esas barreras en que se deja un hueco...
Given that yesterday was "a football day", here you have a shot that reminded me those "barriers" with a hole... (I don't know if "barrier" is the correct word in English, so I'll be glad if anybody can confirm it, it's never too late to learn!)