In order to boost the security during Warsaw Climate Change Conference from 11-22 November 2013, Poland will re-establish border controls border controls with the Czech Republic, Germany, Lithuania and Slovakia between Friday, 8 November and Saturday, 23 November. Security will also be heightened at airports and maritime border crossings. It is kindly advised to to cross-border travellers during the aforementioned dates to carry identification and valid travel documents.
sources: MTI , Hungarian News Agency and http://www.hthtravelinsurance.com