anti terror truck stop protection on sidewalk by barricades as a follow-up to the attack of december 2016

against anti attack berlin block blockade bollard bollards breitscheidplatz christmas city crime downtown event festival german germany kudamm kurfurstendamm kurfafrac14 rstendamm market obstacle outdoor pedestrian people portable precaution prevention protection red safety security sidewalk space stop stopper street system temporary terror terrorism terrorist truck trucks urban vehicle white