Advice for functional inspection of special spraying trains and other vehicles for chemical weed control on railways and public roads / compiled by: SPISE Technical Working Group 6 ; authors: Paolo Balsari (University of Turin, Italy), Jako Kole (SKL, The Netherlands), Harald Kramer (Landwirtschaftskammer Nordrhein Westfalen, Germany) ; editor-in-chief: Prof. Paolo Balsari, University of Turin ; publisher: Julius Kühn Institute - Federal Research Centre for Cultivated Plants